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. Frost, Grant, Faivovich, Bain, Haas, Haddad, de Sá, Channing, Wilkinson, Donnellan, Raxworthy, Campbell, Blotto, Moler, Drewes, Nussbaum, Lynch, Green, and Wheeler, 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, 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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