Catalog Number Suffix Plastotype Genus Subgenus Species Subspecies Author of Species Title for Species Journal for Species Page for Species Date for Species Genoholotype for Genus Author of Genus Title for Genus Journal for Genus Page for Genus Date for Genus
214     Eohippus   borealis   Granger A revision of the American Eocene horses Bulletin of the American Museum of Natural History 242 3/25/8          
258 B   Hyracotherium   cristatum   Wortman Species of Hyracotherium and allied perissodactyls from the Wahsatch and Wind River beds of North America Bulletin of the American Museum of Natural History 97 5/12/1896          
465     Hippidion   speciosus   Leidy [Remarks on Sus americanus, or Harlanus americanus, and on other extinct mammals] Proceedings of the Academy of Natural Sciences of Philadelphia 90 1/2/1856 Hippidion Leidy [Remarks on Sus americanus, or Harlanus americanus, and on other extinct mammals] Proceedings of the Academy of Natural Sciences of Philadelphia 90 1/2/1856
514 A   Mesohippus   proteulophus   Osborn New Oligocene horses Bulletin of the American Museum of Natural History 171 5/28/4            
668     Mesohippus   obliquidens   Osborn New Oligocene horses Bulletin of the American Museum of Natural History 173 5/28/4          
674     Mesohippus   trigonostylus   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 48 5/31/18            
683     Miohippus   crassicuspis   Osborn New Oligocene horses Bulletin of the American Museum of Natural History 178 5/28/4            
1022   Plast Palaeotherium   proutii   Leidy Descriptions of Rhinoceros nebraskensis, Agriochoerus antiquus, Palaeotherium proutii, and P. bairdii Proceedings of the Academy of Natural Sciences of Philadelphia 122 1850          
1180     Mesohippus   hypostylus   Osborn New Oligocene horses Bulletin of the American Museum of Natural History 170 5/28/4            
1192     Miohippus   gidleyi   Osborn New Oligocene horses Bulletin of the American Museum of Natural History 178 5/28/4          
1196     Mesohippus   intermedius   Osborn & Wortman Perissodactyls of the lower Miocene White River beds Bulletin of the American Museum of Natural History 354 12/23/1895          
1197     Mesohippus   copei   Osborn & Wortman Perissodactyls of the lower Miocene White River beds Bulletin of the American Museum of Natural History 356 12/23/1895          
1210     Mesohippus   meteulophus   Osborn New Oligocene horses Bulletin of the American Museum of Natural History 174 5/28/4          
1218     Miohippus   validus   Osborn New Oligocene horses Bulletin of the American Museum of Natural History 177 5/28/4          
1916   Plast Schizotheroides   parvus   Hough An upper Eocene fauna from the Sage Creek area, Beaverhead County, Montana Journal of Paleontology 34 1955 Schizotheriodes Hough An upper Eocene fauna from the Sage Creek area, Beaverhead County, Montana Journal of Paleontology 34 1955
2038     Epihippus   parvus   Granger A revision of the American Eocene horses Bulletin of the American Museum of Natural History 258 3/25/8          
2668     Pliohippus   nobilis   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 160 5/31/18          
4409     Oligotomus   osbornianus   Cope Contributions to the history of the Vertebrata of the lower Eocene of Wyoming and New Mexico, made during 1881 Proceedings of the American Philosophical Society 182 2/20/1882 Ectocion Cope Notes on Eocene Mammalia American Naturalist 522 6/30/1882
4593     Hyracotherium (Pliolophus) montanum   Wortman Species of Hyracotherium and allied perissodactyls from the Wahsatch and Wind River beds of North America Bulletin of the American Museum of Natural History 103 5/12/1896            
4657     Eohippus   restartus   Granger A revision of the American Eocene horses Bulletin of the American Museum of Natural History 240 3/25/8          
4680     Orotherium   index   Cope Fourth notice of extinct Vertebrata from the Bridger and Green River Tertiaries Palaeontological Bulletin 4 10/25/1873 Minippus Froehlich Quo vadis eohippus?  The systematics and taxonomy of the early Eocene equids Zoological Journal of the Linnean Society 162 12/28/2002
4830     Hyracotherium   craspedotum   Cope The bad lands of the Wind River and their fauna American Naturalist 747 10/31/1880            
4832     Hyracotherium   venticolum   Cope On the Vertebrata of the Wind River Eocene beds of Wyoming United States Geological Survey of the Territories Bulletin 198 2/11/1881 Protorohippus Wortman Species of Hyracotherium and allied perissodactyls from the Wahsatch and Wind River beds of North America Bulletin of the American Museum of Natural History 104 5/12/1896
5050     Oligotomus   cinctus   Cope On some Eocene mammals, obtained by Hayden's Geological Survey of 1872 Palaeontological Bulletin 2 3/8/1873 Oligotomus Cope Synopsis of new Vertebrata from the Tertiary of Colorado obtained during the summer of 1873 by Professor E. D. Cope Government Printing Office: Washington D.C. 607 10/31/1873
5051     Orotherium   sylvaticum   Leidy [Remarks on a collection of fossils from Table Mountain, Cal.] Proceedings of the Academy of Natural Sciences of Philadelphia 126 3/14/1871            
5052     Helotherium   procyoninum   Cope Second account of the new Vertebrata from the Bridger Eocene Palaeontological Bulletin 1 8/3/1872 Helotherium Cope Second account of the new Vertebrata from the Bridger Eocene Palaeontological Bulletin 1 8/3/1872
6293     Mesohippus   cuneatus   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 47 5/31/18          
6298     Anchitherium   exoletum   Cope Report on the vertebrate paleontology of Colorado in F. V. Hayden, geologist.  Annual Report of the Geological and Geographic Survey of the Territorie 496 12/31/1874            
6841   Plast Palaeotherium   bairdii   Leidy Descriptions of Rhinoceros nebraskensis, Agriochoerus antiquus, Palaeotherium proutii, and P. bairdii Proceedings of the Academy of Natural Sciences of Philadelphia 122 1850 Mesohippus Marsh Notice of new Tertiary mammals.  IV. American Journal of Science, 3rd series 248 1875
7260     Anchitherium   brachylophum   Cope On some characters of the Miocene fauna of Oregon Proceedings of the American Philosophical Society 74 1/15/1886            
7261     Anchitherium   equiceps   Cope On some characters of the Miocene fauna of Oregon Proceedings of the American Philosophical Society 73 1/15/1886          
7266     Anchitherium   longicristis   Cope On some characters of the Miocene fauna of Oregon Proceedings of the American Philosophical Society 75 1/15/1886          
7267     Miohippus   quartus   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 62 5/31/18            
7269     Kalobatippus   praestans   Cope A new Anchitherium American Naturalist 462 7/31/1879 Kalobatippus Cope & Matthew Hitherto unpublished plates of Tertiary Mammalia and Permian Vertebrata American Museum of Natural History: New York 108 12/31/15
7291     Miohippus   primus   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 61 5/31/18          
8174     Anchitherium   ultimum   Cope On two new species of three-toed horses from the upper Miocene, with notes on the fauna of the Ticholeptus beds Proceedings of the American Philosophical Society 357 10/1/1886 Archaeohippus Gidley A new genus of horse from the Mascall beds, with notes on a small collection of equine teeth in the University of California Bulletin of the American Museum of Natural History 385 12/19/6
8175     Hippotherium   isonesum   Cope A review of the North America species of Hippotherium Proceedings of the American Philosophical Society 451 7/2/1890 Acritohippus Kelly New Miocene horses from the Caliente Formation, Cuyama Valley Badlands, California Contributions in Science Los Angeles County Museum 9 7/27/95
8178     Hippotherium   sinclairi   Wortman On the origin and development of the existing horses Kansas City Review of Science and Industry 73 4/30/1882          
8180     Stylonus   seversus   Cope On some characters of the Miocene fauna of Oregon Proceedings of the American Philosophical Society 76 1/15/1886 Stylonus Cope On some characters of the Miocene fauna of Oregon Proceedings of the American Philosophical Society 76 1/15/1886
8183     Hippidium   spectans   Cope A new Hippidium American Naturalist 223 3/31/1880          
8249     Hippotherium   paniense   Cope Report on the stratigraphy and Pliocene vertebrate paloenotology of northern Colorado United States Geological Survey of the Territories Bulletin 12 1/21/1874          
8266     Protohippus   labrosus   Cope Report on the stratigraphy and Pliocene vertebrate paloenotology of northern Colorado United States Geological Survey of the Territories Bulletin 13 1/21/1874          
8281     Hippotherium   sphenodus   Cope A review of the North America species of Hippotherium Proceedings of the American Philosophical Society 449 7/2/1890          
8291     Protohippus   sejunctus   Cope Report on the stratigraphy and Pliocene vertebrate paloenotology of northern Colorado United States Geological Survey of the Territories Bulletin 15 1/21/1874          
8340     Protohippus   perditus secundus Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 144 5/31/18          
8344     Protohippus   castilli   Cope Pliocene horses of southwestern Texas American Naturalist   12/31/1885          
8345     Neohipparion   montezumae   Gidley Revision of the Miocene and Pliocene Equidae of North America Bulletin of the American Museum of Natural History 900 11/26/7            
8346     Hippotherium   rectidens   Cope On two new species of three-toed horses from the upper Miocene, with notes on the fauna of the Ticholeptus beds Proceedings of the American Philosophical Society 360 10/1/1886          
8347     Merychippus   republicanus   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 125 5/31/18            
8347 A   Merychippus   patruus   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 126 5/31/18            
8349     Protohippus   profectus   Cope A review of the North America species of Hippotherium Proceedings of the American Philosophical Society 447 7/2/1890            
8350     Hippotherium   retrusum   Cope A review of the North America species of Hippotherium Proceedings of the American Philosophical Society 446 7/2/1890 Pseudhipparion Ameghino Recherces de morphologie phylogenetique sur les molaires superieurs de ongles Recherches de morphologie phylogenetique sur les molaires superieures des ongles Anales del Museo Nacional de Historia Natural de Buenos Aires, 3rd series 262 1/7/4
8360     Protohippus   medius   Cope On the permanent and temporary dentitions of certain three-toed horses American Naturalist 5 11/30/1892            
8616     Equus   giganteus   Gidley Tooth characters and revision of the North American species of the genus Equus Bulletin of the American Museum of Natural History 137 5/31/1            
8673     Hippotherium   relictum   Cope An intermediate Pliocene fauna American Naturalist 253 4/30/1889          
8791     Mesohippus   eulophus   Osborn New Oligocene horses Bulletin of the American Museum of Natural History 173 5/28/4            
9040     Parahippus   coloradensis   Gidley Revision of the Miocene and Pliocene Equidae of North America Bulletin of the American Museum of Natural History 932 11/26/7          
9085     Parahippus   pawniensis   Gidley Revision of the Miocene and Pliocene Equidae of North America Bulletin of the American Museum of Natural History 932 11/26/7          
9094     Hipparion   coloradensis   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 183 5/31/18          
9096     Merychippus   campestris   Gidley Revision of the Miocene and Pliocene Equidae of North America Bulletin of the American Museum of Natural History 928 11/26/7          
9115 B   Protohippus   proplacidus   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 140 5/31/18          
9200     Equus   fraternus   Leidy [Notice of fossil Mammalia from the valley of Niobrara River] Proceedings of the Academy of Natural Sciences of Philadelphia 11 4/19/1858          
9394     Merychippus   proparvulus   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 117 5/31/18            
9397     Merychippus   eoplacidus   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 114 5/31/18          
9402     Merychippus   eohipparion   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 117 5/31/18          
9407     Hypohippus   osborni   Gidley Revision of the Miocene and Pliocene Equidae of North America Bulletin of the American Museum of Natural History 930 11/26/7            
9662     Mesohippus   montanus   Osborn New Oligocene horses Bulletin of the American Museum of Natural History 170 5/28/4          
9815     Neohipparion   whitneyi   Gidley A new three-toed horse Bulletin of the American Museum of Natural History 467 7/24/3 Neohipparion Gidley A new three-toed horse Bulletin of the American Museum of Natural History 466 7/24/3
9820     Protohippus   simus   Gidley New or little known mammals from the Miocene of South Dakota.  American Museum Expedition of 1903.  Part IV.  Equidae Bulletin of the American Museum of Natural History 139 5/26/6          
9972   Plast Equus   pacificus   Leidy Notice of some remains of horses Proceedings of the Academy of Natural Sciences of Philadelphia 195 1868          
10606     Equus   scotti   Gidley A new species of Pleistocene horse from the Staked Plains of Texas Bulletin of the American Museum of Natural History 111 8/8/0            
10764   Plast Equus   fraternus pectinatus Cope Vertebrate remains from Port Kennedy bone deposit Journal of the Academy of Natural Sciences of Philadelphia 257 1899          
10765   Plast Equus   excelsus   Leidy Notice of remains of extinct Vertebrata, from the valley of the Niobrara River, collected during the exploring expedition of 1857, in Nebraska, under the command of Lieut. G. K. Warren, U. S. Top. Eng Proceedings of the Academy of Natural Sciences of Philadelphia 26 1858          
10766   Plast Equus   complicatus   Leidy [Notice of fossil Mammalia from the valley of Niobrara River] Proceedings of the Academy of Natural Sciences of Philadelphia 11 1858          
10767   Plast Equus   occidentalis   Leidy Bones and teeth of horses from California and Oregon Proceedings of the Academy of Natural Sciences of Philadelphia 94 1865            
10769   Plast Anchippus   texanus   Leidy Notice of some remains of extinct pachyderms Proceedings of the Academy of Natural Sciences of Philadelphia 231 1868 Anchippus Leidy Notice of some remains of extinct pachyderms Proceedings of the Academy of Natural Sciences of Philadelphia 231 1868
10770   Plast Merychippus   insignis   Leidy Notices of extinct Vertebrata discovered by Dr. F. V. Hayden, during the expedition to the Sioux country under the command of Lieut. G. K. Warren Proceedings of the Academy of Natural Sciences of Philadelphia 311 1856 Merychippus Leidy Notices of extinct Vertebrata discovered by Dr. F. V. Hayden, during the expedition to the Sioux country under the command of Lieut. G. K. Warren Proceedings of the Academy of Natural Sciences of Philadelphia 311 1856
10771   Plast Anchitherium (Hypohippus) affinis   Leidy Notice of remains of extinct Vertebrata, from the valley of the Niobrara River, collected during the exploring expedition of 1857, in Nebraska, under the command of Lieut. G. K. Warren, U. S. Top. Eng Proceedings of the Academy of Natural Sciences of Philadelphia 26 1858 Hypohippus Leidy Notice of remains of extinct Vertebrata, from the valley of the Niobrara River, collected during the exploring expedition of 1857, in Nebraska, under the command of Lieut. G. K. Warren, U. S. Top. Eng Proceedings of the Academy of Natural Sciences of Philadelphia 26 1858
10772   Plast Anchitherium (Parahippus) cognatus   Leidy Notice of remains of extinct Vertebrata, from the valley of the Niobrara River, collected during the exploring expedition of 1857, in Nebraska, under the command of Lieut. G. K. Warren, U. S. Top. Eng Proceedings of the Academy of Natural Sciences of Philadelphia 26 1858 Parahippus Leidy Notice of remains of extinct Vertebrata, from the valley of the Niobrara River, collected during the exploring expedition of 1857, in Nebraska, under the command of Lieut. G. K. Warren, U. S. Top. Eng Proceedings of the Academy of Natural Sciences of Philadelphia 26 1858
10773   Plast Equus (Protohippus) perditus   Leidy Notice of remains of extinct Vertebrata, from the valley of the Niobrara River, collected during the exploring expedition of 1857, in Nebraska, under the command of Lieut. G. K. Warren, U. S. Top. Eng Proceedings of the Academy of Natural Sciences of Philadelphia 26 1858 Protohippus Leidy Notice of remains of extinct Vertebrata, from the valley of the Niobrara River, collected during the exploring expedition of 1857, in Nebraska, under the command of Lieut. G. K. Warren, U. S. Top. Eng Proceedings of the Academy of Natural Sciences of Philadelphia 26 1858
10774   Plast Merychippus   mirabilis   Leidy Notice of remains of extinct Vertebrata, from the valley of the Niobrara River, collected during the exploring expedition of 1857, in Nebraska, under the command of Lieut. G. K. Warren, U. S. Top. Eng Proceedings of the Academy of Natural Sciences of Philadelphia 27 1858          
10775   Plast Hippotherium   montezuma   Leidy On an extinct peccary Proceedings of the Academy of Natural Sciences of Philadelphia 291 1882          
10776   Plast Protohippus   supremus   Leidy The extinct mammalian fauna of Dakota and Nebraska, including an account of some allied forms from other localities together with a synopsis of the mammalian remains of North America Journal of the Academy of Natural Sciences of Philadelphia 328 1869          
10779   Plast Hipparion   affine   Leidy The extinct mammalian fauna of Dakota and Nebraska, including an account of some allied forms from other localities together with a synopsis of the mammalian remains of North America Journal of the Academy of Natural Sciences of Philadelphia 286 1869          
10782   Plast Desmatippus   crenidens   Scott The mammals of the Deep River beds American Naturalist 661 1893 Desmatippus Scott The mammals of the Deep River beds American Naturalist 661 1893
10783   Plast Anchitherium   equinum   Scott The mammals of the Deep River beds American Naturalist 661 1893          
10788   Plast Hipparion   gratum   Leidy The extinct mammalian fauna of Dakota and Nebraska, including an account of some allied forms from other localities together with a synopsis of the mammalian remains of North America Journal of the Academy of Natural Sciences of Philadelphia 287 1869 Griphippus Quinn Miocene Equidae of the Texas Gulf Coastal Plain University of Texas Bureau of Economic Geology Publication 42 1955
10794   Plast Hipparion   occidentale   Leidy Notice of some remains of extinct Mammalia, recently discovered by Dr. F. V. Hayden in the bad lands of Nebraska Proceedings of the Academy of Natural Sciences of Philadelphia 59 1856 Cormohipparion Skinner & MacFadden Cormohipparion n. gen. (Mammalia, Equidae) from the North American Miocene (Barstovian - Clarendonian) Journal of Paleontology 917 1977
10828     Neohipparion   niobrarense   Gidley New or little known mammals from the Miocene of South Dakota.  American Museum Expedition of 1903.  Part IV.  Equidae Bulletin of the American Museum of Natural History 151 5/26/6          
10865     Neohipparion   dolichops   Gidley New or little known mammals from the Miocene of South Dakota.  American Museum Expedition of 1903.  Part IV.  Equidae Bulletin of the American Museum of Natural History 148 5/26/6            
11625     Orohippus   atavus   Granger A revision of the American Eocene horses Bulletin of the American Museum of Natural History 253 3/25/8            
11860     Mesohippus   brachystylus   Osborn New Oligocene horses Bulletin of the American Museum of Natural History 175 5/28/4            
11872   Plast Equus   neogaeus   Lund Nouvelles recherches sur la faune fossile de Bresil Annales des Sciences Naturelles, 2nd series 318 1840 Hippidion Owen On fossil teeth of equines from Central and South America Proceedings of the Royal Society of London 268 1875
11872   Plast Equus   neogaeus   Lund Nouvelles recherches sur la faune fossile de Bresil Annales des Sciences Naturelles, 2nd series 318 1840 Rhinippus Burmeister Los Caballos fosiles de la Pampa Argentina La Tribuna: Buenos Aires 15 1875
12120     Orohippus   progressus   Granger A revision of the American Eocene horses Bulletin of the American Museum of Natural History 250 3/25/8            
12912     Miohippus   equinanus   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 65 5/31/18          
12918     Parahippus   pristinus   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 76 5/31/18          
13018     Parahippus   coloradensis praecurrans Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 83 5/31/18          
13770     Parahippus   nebraskensis primus Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 80 5/31/18            
13808     Miohippus   gemmarosae   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 66 5/31/18          
14179     Merychippus   isonesus secundus Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 105 5/31/18            
14180     Merychippus   isonesus tertius Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 105 5/31/18            
14184     Merychippus   isonesus quartus Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 107 5/31/18            
14185     Merychippus   isonesus quintus Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 107 5/31/18          
14187     Merychippus   isonesus primus Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 102 5/31/18          
14211     Kalobatippus   agatensis   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 71 5/31/18          
14233     Parahippus   pawniensis atavus Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 80 5/31/18          
14347   Plast Hyracotherium   leporinum   Owen Description of the fossil remains of a mammal, a bird, and a serpent from the London Clay Proceedings of the Geological Society of London 163 1840 Hyracotherium Owen Description of the fossil remains of a mammal, a bird, and a serpent from the London Clay Proceedings of the Geological Society of London 163 1840
14387   Plast Hippidium   interpolatum   Cope A preliminary report on the vertebrate paleontology of the Llano Estacado Annual Report of the Geological Survey of Texas 42 1893            
14388   Plast Pliohippus   simplicidens   Cope A contribution to the vertebrate paleontology of Texas Proceedings of the American Philosophical Society 124 1892            
14389   Plast Equus   semiplicatus   Cope A preliminary report on the vertebrate paleontology of the Llano Estacado Annual Report of the Geological Survey of Texas 80 1893          
14390   Plast Hipparion   lenticulare   Cope A preliminary report on the vertebrate paleontology of the Llano Estacado Annual Report of the Geological Survey of Texas 41 1893          
14391   Plast Equus   eurystylus   Cope A preliminary report on the vertebrate paleontology of the Llano Estacado Annual Report of the Geological Survey of Texas 43 1893            
14392   Plast Equus   minutus   Cope A preliminary report on the vertebrate paleontology of the Llano Estacado Annual Report of the Geological Survey of Texas 67 1893            
14393   Plast Equus   cumminsi   Cope A preliminary report on the vertebrate paleontology of the Llano Estacado Annual Report of the Geological Survey of Texas 67 1893          
14394   Plast Protohippus   pachyops   Cope A preliminary report on the vertebrate paleontology of the Llano Estacado Annual Report of the Geological Survey of Texas 26 1893          
14395   Plast Protohippus   fossulatus   Cope A preliminary report on the vertebrate paleontology of the Llano Estacado Annual Report of the Geological Survey of Texas 30 1893          
14396   Plast Equus   occidentalis   Leidy The extinct mammalian fauna of Dakota and Nebraska, including an account of some allied forms from other localities together with a synopsis of the mammalian remains of North America Journal of the Academy of Natural Sciences of Philadelphia 267 1869          
14474   Plast Anchitherium   anceps   Marsh Notice of new equine mammals from the Tertiary formation American Journal of Science, 3rd series 250 1874          
15899   Plast Pliolophus   vulpiceps   Owen Description of small Lophiodont mammal (Pliolophus vulpiceps, Owen), from the London Clay, near Harwich Proceedings of the Geological Society of London 58 1858 Pliolophus Owen Description of small Lophiodont mammal (Pliolophus vulpiceps, Owen), from the London Clay, near Harwich Proceedings of the Geological Society of London 58 1858
16134     Hyracotherium   angustidens grangeri Kitts American Hyracotherium (Perissodactyla, Equidae) Bulletin of the American Museum of Natural History 42 5/21/56 Arenahippus Froehlich Quo vadis eohippus?  The systematics and taxonomy of the early Eocene equids Zoological Journal of the Linnean Society 165 12/28/2002
16134 A   Hyracotherium   angustidens grangeri Kitts American Hyracotherium (Perissodactyla, Equidae) Bulletin of the American Museum of Natural History 42 5/21/56          
16134 B   Hyracotherium   angustidens grangeri Kitts American Hyracotherium (Perissodactyla, Equidae) Bulletin of the American Museum of Natural History 42 5/21/56            
17224     Pliohippus   leidyanus   Osborn Equidae of the Oligocene, Miocene, and Pliocene of North America. Iconographic type revision Memoirs of the American Museum of Natural History 162 5/31/18 Dinohippus Quinn Miocene Equidae of the Texas Gulf Coastal Plain University of Texas Bureau of Economic Geology Publication 43 8/15/55
17225     Pliohippus   lullianus   Troxell An early Pliocene one-toed horse, Pliohippus lullianus sp. nov. American Journal of Science, 4th series 336 10/31/16            
17232     Hypohippus   pertinax   Matthew Contributions to the Snake Creek fauna with notes upon the Pleistocene of western Nebraska.  American Museum Expedition of 1916 Bulletin of the American Museum of Natural History 211 4/18/18          
17724     Griphodon   peruvianus   Anthony A new fossil perissodactyl from Peru American Museum Novitates 1 4/21/24 Griphodon Anthony A new fossil perissodactyl from Peru American Museum Novitates 1 4/21/24
18950     Archaeohippus   penultimus   Matthew Third contribution to the Snake Creek Fauna Bulletin of the American Museum of Natural History 158 7/3/24          
22601   Plast Onohippidium   munizi   Moreno Onohippidion munizi.  Breve noticia sobre los restos fosiles du un genero neuvo de la familia de los Equidae conservadas en el Museo de La Plata Revista del Museo de La Plata Paleontologia 65 1891 Onohippidium Moreno Onohippidion munizi.  Breve noticia sobre los restos fosiles du un genero neuvo de la familia de los Equidae conservadas en el Museo de La Plata Revista del Museo de La Plata Paleontologia 65 1891
22628   Plast Equus   francisci   Hay Contributions to the knowledge of the mammals of the Pleistocene of North America Proceedings of the United States National Museum 535 1915          
22642   Plast Hypohippus   matthewi   Barbour A new fossil horse, Hypohippus matthewi Nebraska Geological Survey 171 1914 Megahippus McGrew The Burge Fauna a lower Pliocene mammalian assemblage from Nebraska University of California Publications Bulletin of the Department of Geological Sciences 315 1938
22733     Equus   intermedius   Cope On some Pleistocene Mammalia from Petite Anse, La. Proceedings of the American Philosophical Society 463 3/20/1896            
26502     Anchitherium   gobiense   Colbert A new Anchitheriine horse from the Tung Gur Formation of Mongolia American Museum Novitates 1 4/12/39            
30079   Plast Protohippus   ansae   Matthew & Stirton Equidae from the Pliocene of Texas University of California Publications Bulletin of the Department of Geological Sciences 361 1930 Astrohippus Stirton Phylogeny of North American Equidae University of California Publications Bulletin of the Department of Geological Sciences 190 1940
32663   Plast Hippotherium   ingenuum   Leidy Rhinceros and Hippotherium from Florida Proceedings of the Academy of Natural Sciences of Philadelphia 33 1885 Notiocradohipparion Hulbert Cormohipparion and Hipparion (Mammalia, Perissodactyla, Equidae) from the late Neogene of Florida Bulletin of the Florida State Museum.  Biological Sciences 236 1988
32664   Plast Hippotherium   plicatile   Leidy Fossil bones from Florida Proceedings of the Academy of Natural Sciences of Philadelphia 310 1887          
32793   Plast Calippus   martini   Hesse Neue beuteltierreste aus der Mitteleozanen braunkhole des geiseltales bei Halle (Salle) Abhandlungen der Kaiserlichen Leopoldinisch-Carolinischen Deutschen Akademie der Naturforscher 52 1936 Grammohippus Hulbert Calippus and Protohippus (Mammalia, Perissodactyla, Equidae) from the Miocene (Barstovian - early Hemphillian) of the Gulf Coastal Plain Bulletin of the Florida State Museum.  Biological Sciences 254 1988
32794   Plast Equus   idahoensis   Merriam New Mammalia from the Idaho Formation University of California Publications Bulletin of the Department of Geology 527 1918            
32795   Plast Neohipparion   gidleyi   Merriam New species of the Hipparion group from the Pacific Coast and Great Basin provinces of North America University of California Publications Bulletin of the Department of Geology 1 1915            
38960     Equus   yunnanensis   Colbert Pleistocene mammals fron the Ma Kai valley of northern Yunnan, China American Museum Novitates 1 12/31/40            
45890   Plast Pliolophus   vulpiceps   Owen Description of small Lophiodont mammal (Pliolophus vulpiceps, Owen), from the London Clay, near Harwich Proceedings of the Geological Society of London 58 1858 Pliolophus Owen Description of small Lophiodont mammal (Pliolophus vulpiceps, Owen), from the London Clay, near Harwich Proceedings of the Geological Society of London 58 1858
45892   Plast Hyracotherium   cuniculus   Owen Description of some molar teeth from the Eocene sand at Kyson in Suffolk, indicative of a new species of Hyraoctherium (Hyr. cuniculus) Annals and Magazine of Natural History 227 1841            
55543   Plast Equus (Hesperopithecus) mexicanus   Hibbard Pleistocene vertebrates from the upper Becerra (Becerra Surperior) Formation, valley of Tequixquiac, Mexico, with notes on other Pleistocene forms Contributions from the Museum of Paleontology The University of Michigan 66 1955          
55552   Plast Merychippus   westoni   Simpson A new specimen of Eodelphis cutleri from the Belly River Formation of Alberta Bulletin National Museum of Canada 164 1930            
55553   Plast Merychippus   gunteri   Simpson Tertiary land mammals of Florida Bulletin of the American Museum of Natural History 165 1930            
55554   Plast Archaeohippus   nanus   Simpson Miocene land mammals from Florida Bulletin of the Florida State Geological Survey 28 1932            
55555   Plast Anchitherium   clarencei   Simpson Miocene land mammals from Florida Bulletin of the Florida State Geological Survey 32 1932            
55571   Plast Miohippus   blackbergi   Hay Description of some fossil vertebrates from the upper Miocene of Texas Proceedings of the Biological Society of Washington 4 1924          
55904   Plast Pachynolophus   gaudryi   Lemoine Mammiferes et oiseaus fossiles des environs des Reims La Nature 19 1878 Propachynolophus Lemoine Etude d'ensemble sur les dents des mammiferes fossiles des environs de Reims Bulletin de la Societe Geologique de France, serie 3 285 1891
55930   Plast Pachynolophus   maldani   Lemoine Etude d'ensemble sur les dents des mammiferes fossiles des environs de Reims Bulletin de la Societe Geologique de France, serie 3 285 1891          
56600   Plast Pachynolophus   gaudryi   Lemoine Mammiferes et oiseaus fossiles des environs des Reims La Nature 19 1878 Propachynolophus Lemoine Etude d'ensemble sur les dents des mammiferes fossiles des environs de Reims Bulletin de la Societe Geologique de France, serie 3 285 1891
56601   Plast Pachynolophus   maldani   Lemoine Etude d'ensemble sur les dents des mammiferes fossiles des environs de Reims Bulletin de la Societe Geologique de France, serie 3 285 1891          
57396   Plast Pachynolophus   duvalii   Gervais Zoologie et Paleontologie Francaise [Privately published] 126 1859          
59765   Plast Anchitherium   agreste   Leidy Contribution to the extinct vertebrate fauna of the Western Territories Report of the U. S. Geological Survey of the Territories, F. V. Hayden, U. S. 251 1873          
70112     Pseudhipparion   skinneri   Webb & Hulbert Systematics and evolution of Pseudhipparion (Mammalia, Equidae) from the late Neogene of the Gulf Coastal Plain and Great Plains Contributions to Geology Special Paper 254 10/31/86          
73950     Hipparion   shirleyi   MacFadden Systematics and phylogeny of Hipparion, Neohipparion, Nannippus and Cormohipparion (Mammalia, Equidae) from the Miocene and Pliocene of the New World Bulletin of the American Museum of Natural History 58 11/15/84            
74940     Cormohipparion   goorisi   MacFadden & Skinner Earliest Holarctic hipparion, Cormohipparion goorisi n. sp. (Mammalia, Equidae), from the Barstovian (medial Miocene) Texas Gulf Coastal Plain Journal of Paleontology 620 5/31/1981          
74000   Plast Palaeotherium   bairdii   Leidy Descriptions of Rhinoceros nebraskensis, Agriochoerus antiquus, Palaeotherium proutii, and P. bairdii Proceedings of the Academy of Natural Sciences of Philadelphia 122 1850 Mesohippus Marsh Notice of new Tertiary mammals.  IV. American Journal of Science, 3rd series 248 1875
79350     Hipparion   shirleyi   MacFadden Systematics and phylogeny of Hipparion, Neohipparion, Nannippus and Cormohipparion (Mammalia, Equidae) from the Miocene and Pliocene of the New World Bulletin of the American Museum of Natural History 58 11/15/84            
81094 A   Parahippus   integer   Matthew Third contribution to the Snake Creek Fauna Bulletin of the American Museum of Natural History 154 7/3/24            
81094 B   Parahippus   integer   Matthew Third contribution to the Snake Creek Fauna Bulletin of the American Museum of Natural History 154 7/3/24            
89638   Plast Eoequus   wilsoni   Quinn Miocene Equidae of the Texas Gulf Coastal Plain University of Texas Bureau of Economic Geology Publication 54 1955 Eoequus Quinn Miocene Equidae of the Texas Gulf Coastal Plain University of Texas Bureau of Economic Geology Publication 54 1955
89761   Plast Equus   stehlini   Azzaroli The two Villafranchian horses of the Upper Valdarno Palaeontographia Italica 9 1965            
95582   Plast Haplohippus   texanus   McGrew A new and primitive early Oligocene horse from trans-Pecos Texas Fieldiana Geology 167 1953 Haplohippus McGrew A new and primitive early Oligocene horse from trans-Pecos Texas Fieldiana Geology 167 1953
99210   Plast Hippotherium   princeps   Kaup [Letter addressed to von Leonard] Neues Jahrbuch fur Mineralogie, Geologie und Palaeontologie 327 1833 Hippotherium Kaup [Letter addressed to von Leonard] Neues Jahrbuch fur Mineralogie, Geologie und Palaeontologie 327 1833
100077     Onohippidium   galushi   MacFadden & Skinner Diversification and biogeography of the one-toed horses Postilla 3 5/2/79            
102139   Plast Pliohippus   hondurensis   Olson & McGrew Mammalian fauna from the Pliocene of Honduras Bulletin of the Geological Society of America 1232 1941          
104962   Plast Equus   hatcheri   Hay Contributions to the knowledge of the mammals of the Pleistocene of North America Proceedings of the United States National Museum 527 1915          
105179   Plast Parahippus   nebraskensis   Peterson The Miocene beds of western Nebraska and eastern Wyoming and the vertebrate faunae Annals of the Carnegie Museum 57 1906          
108834   Plast Equus   littoralis   Hay Notes on some fossil horses, with descriptions of four new species Proceedings of the United States National Museum 575 1913          
109519   Plast Gobihippus   menneri   Dashzeveg Ob arkhaicheskom predstavitele loshadinykh (Mammalia, Perissodactyla) iz Eotsena tsestralynoy Azii Fayna Mezozoya i kaynozoya Mongolii 15 1979 Gobihippus Dashzeveg Ob arkhaicheskom predstavitele loshadinykh (Mammalia, Perissodactyla) iz Eotsena tsestralynoy Azii Fayna Mezozoya i kaynozoya Mongolii 15 1979
109624   Plast Hypohippus (Drymohippus) nevadensis   Merriam New anchitheriine horses from the Tertiary of the Great Basin area University of California Publications Bulletin of the Department of Geology 420 1913 Drymohippus Merriam New anchitheriine horses from the Tertiary of the Great Basin area University of California Publications Bulletin of the Department of Geology 420 1913
109662   Plast Equus   caballus primigenius Meyer [Fossils froom Gmund; fossil horse] Taschenbuch fur Die Gesammte Mineralogie 150 1829 Hipparion Christol [Description of Hipparion] Annales des sciences et de l'industrie du Midi de la France 181 1832
109753   Plast Hipparion   primigenium melendezi Alberdi El genero Hipparion en Espana.  Nuevas formas de Castilla y Adalucia, revision e historia evolutiva Consejo Superior de Investigaciones Cientifica Trabour sobre Neogeno-Cuaternario 58 1974          
109758   Plast Hipparion   fissurae   Crusafont & Sondaar Une nouvelle espece d'Hipparion du Pliocene terminal d'Espagne Palaeovertebrata 61 1971          
109759   Plast Hipparion   afarense   Eisenmann Noveaux cranes d'hipparions (Mammalia, Perissodactyla) Plio-Pleistocenes d'Afrique orientale (Ethiopia et Kenya): Hipparion sp., Hipparion cf. ethiopicum, et Hipparion afarense nov. sp. Geobios 589 1976            
109761   Plast Hipparion   africanum   Arambourg Vertebres continentaux du Miocene superior de l'Afrique du nord Publications du Service de la Carte Geologique de l'Algerie (nouvelle serie) Paleontologie Memoire 75 1959          
110371   Plast Merychippus   intermontanus   Merriam New horses from the Miocene and Pliocene of California University of California Publications Bulletin of the Department of Geology 50 1915          
111742   Plast Merychippus   calamarius stylodontus Merriam Tertiary mammalian faunas of the Mohave Desert University of California Publications Bulletin of the Department of Geology 505 1919          
113849   Plast Hipparion   xizangense   Zheng The Hipparion fauna of Bulong basin, Biru, Xizang in Palaeontology of Xizang 39 1980            
113850   Plast Hipparion   xizangense   Zheng The Hipparion fauna of Bulong basin, Biru, Xizang in Palaeontology of Xizang 39 1980          
113852   Plast Hipparion   xizangense   Zheng The Hipparion fauna of Bulong basin, Biru, Xizang in Palaeontology of Xizang 39 1980            
113853   Plast Hipparion   chiai   Liu et al. Fossil vertebrates from the Pliocene of Lantian County, Shaanxi Province Professional Papers of Stratigraphy and Palaeontology 172 1978            
113854   Plast Hipparion (Cremohipparion) licenti   Qiu et al. The Chinese hipparionine fossils Palaeontologica Sinica, series C 64 1987          
113855   Plast Hipparion   houfenense   Teilhard & Young Fossil mammals from the late Cenozoic of northern China Palaeontologica Sinica, series C 49 1931          
113865   Plast Hipparion   weihoense   Liu et al. Fossil vertebrates from the Pliocene of Lantian County, Shaanxi Province Professional Papers of Stratigraphy and Palaeontology 166 1978          
114010   Plast Equus   quinni   Slaughter et al. The Hill-Shuler local faunas of the upper Trinity River, Dallas and Denton Counties. Texas Report of Investigation Bureau of Economic Geology University of Texas 33 1962          
114100     Calippus (Grammohippus) cerasinus   Hulbert Calippus and Protohippus (Mammalia, Perissodactyla, Equidae) from the Miocene (Barstovian - early Hemphillian) of the Gulf Coastal Plain Bulletin of the Florida State Museum.  Biological Sciences 264 1/22/88          
116906     Pseudhipparion   hessei   Webb & Hulbert Systematics and evolution of Pseudhipparion (Mammalia, Equidae) from the late Neogene of the Gulf Coastal Plain and Great Plains Contributions to Geology Special Paper 250 10/31/86          
117168   Plast Onager (Hesperchippus) hibbardi   Mooser Una zebra fosil de la Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 428 1958          
117169   Plast Protohippus   muelleri   Mooser Una nueva especie de equido del genero Protohippus del Plioceno medio de Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 157 1965          
117170   Plast Neohipparion   otomii   Mooser Un equido fosil del genero Neohipparion de la Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 376 1960          
117170   Plast Neohipparion   otomii   Mooser Un equido fosil del genero Neohipparion de la Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 376 1960          
117170   Plast Neohipparion   otomii   Mooser Un equido fosil del genero Neohipparion de la Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 376 1960            
117170   Plast Neohipparion   otomii   Mooser Un equido fosil del genero Neohipparion de la Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 376 1960          
117170   Plast Neohipparion   otomii   Mooser Un equido fosil del genero Neohipparion de la Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 376 1960          
117170   Plast Neohipparion   otomii   Mooser Un equido fosil del genero Neohipparion de la Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 376 1960          
117170   Plast Neohipparion   otomii   Mooser Un equido fosil del genero Neohipparion de la Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 376 1960          
117170   Plast Neohipparion   otomii   Mooser Un equido fosil del genero Neohipparion de la Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 376 1960          
117170   Plast Neohipparion   otomii   Mooser Un equido fosil del genero Neohipparion de la Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 376 1960            
117170   Plast Neohipparion   otomii   Mooser Un equido fosil del genero Neohipparion de la Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 376 1960          
117170   Plast Neohipparion   otomii   Mooser Un equido fosil del genero Neohipparion de la Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 376 1960          
117171   Plast Neohipparion   otomii   Mooser Un equido fosil del genero Neohipparion de la Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 376 1960          
117171   Plast Neohipparion   otomii   Mooser Un equido fosil del genero Neohipparion de la Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 376 1960          
117178   Plast Neohipparion   monais   Mooser Neohipparion monais n. sp. equido fosil del Plioceno de la Mesa Central de Mexico Anales del Instituto de Biologia de la Universidad Nacional Autonoma de Mexico 394 1964          
122037   Plast Propalaeotherium   hengyangensis   Young Note on the first Eocene mammal from south China American Museum Novitates 1 1944          
125627   Plast Merychippus   missouriensis   Douglass Fossil Horses from North Dakota and Montana Annals of the Carnegie Museum 274 1908          
125648   Plast Mesohippus   grandis   Clark & Beerbower Geology, paleoecology, and paleoclimatology of the Chadron Formation Fieldiana Geology Memoir 48 1967          
126856   Plast Megahippus   mckenna   Tedford & Alf A new Megahippus from the Barstow Formation of San Bernardino County, California Bulletin of the Southern California Academy of Sciences 113 1962          
127483   Plast Hyracotherium   sandrae   Gingerich New earliest Wasatchian mammalian fauna from the Eocene of northwestern Wyoming: composition and diversity in a rarely sampled high-floodplain assemblage Papers on Paleontology 58 1989            
129310   Plast Hipparion   richthofeni pater Matsumoto On Hipparion richthofeni Koken. Science Reports of Tohoku Imperial University 2nd series Geology 61 1927            
129311   Plast Hipparion (Baryhipparion) insperatum   Qiu et al. The Chinese hipparionine fossils Palaeontologica Sinica, series C 68 1987 Baryhipparion Qiu et al. The Chinese hipparionine fossils Palaeontologica Sinica, series C 68 1987