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Hypopachus Keferstein, 1867
Hypopachus Keferstein, 1867, Nachr. Ges. Wiss. Göttingen, 18: 351. Type species: Hypopachus Seebachii Keferstein, 1867 (= Engystoma variolosum Cope, 1866), by monotypy.
Sheep Frogs (Conant, Cagle, Goin, Lowe, Neill, Netting, Schmidt, Shaw, Stebbins, and Bogert, 1956, Copeia, 1956: 176; Conant, 1975, Field Guide Rept. Amph. E. Cent. N. Am., Ed. 2: 336; Collins, Huheey, Knight, and Smith, 1978, Herpetol. Circ., 7: 11; Liner, 1994, Herpetol. Circ., 23: 25; Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 90; Crother, Boundy, Campbell, de Queiroz, Frost, Highton, Iverson, Meylan, Reeder, Seidel, Sites, Taggart, Tilley, and Wake, 2001 "2000", Herpetol. Circ., 29: 11; Frost, McDiarmid, and Mendelson, 2008, in Crother (ed.), Herpetol. Circ., 37: 6; Liner and Casas-Andreu, 2008, Herpetol. Circ., 38: 15; Collins and Taggart, 2009, Standard Common Curr. Sci. Names N. Am. Amph. Turtles Rept. Crocodil., ed. 6: 8; Frost, McDiarmid, Mendelson, and Green, 2012, in Crother (ed.), Herpetol. Circ., 39: 16).
Southern Texas (USA) and southern Sonora (Mexico) to Costa Rica.
See comments under Dermatonotus and Gastrophryne. Formerly in the New World component of Microhylinae; Frost, Grant, Faivovich, Bain, Haas, Haddad, de Sá, Channing, Wilkinson, Donnellan, Raxworthy, Campbell, Blotto, Moler, Drewes, Nussbaum, Lynch, and Green, 2006, Bull. Am. Mus. Nat. Hist., 297: 225, removed Hypopachus from any subfamily pending resolution of its phylogenetic placement. van der Meijden, Vences, Hoegg, Boistel, Channing, and Meyer, 2007, Mol. Phylogenet. Evol., 44: 1017–1030, on the basis of DNA sequences evidence placed Hypopachus within Gastrophryninae and the sister taxon of Gastrophryne. Pyron and Wiens, 2011, Mol. Phylogenet. Evol., 61: 543–583, in their study of Genbank sequences, confirmed this relationship. Streicher, Cox, Campbell, Smith, and de Sá, 2012, Mol. Phylogenet. Evol., 64: 645–653, remedied the paraphyly of former Gastrophryne by transferring Gastrophryne usta and Gastrophryne pictiventris to Hypopachus. Köhler, 2011, Amph. Cent. Am.: 287–288, provided a brief summary of natural history and provided an identification key, range map, and photograph of the species.
Contained taxa (4 sp.):
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