Cystignathus fragilis Brocchi, 1877, Bull. Soc. Philomath., Paris, Ser. 7, 1: 182. Holotype: MNHNP 6316, according to Kellogg, 1932, Bull. U.S. Natl. Mus., 160: 85, and Guibé, 1950 "1948", Cat. Types Amph. Mus. Natl. Hist. Nat.: 30. Type locality: "Tehuantepec (Mexique)".
Leptodactylus fragilis — Brocchi, 1881, Miss. Scient. Mex. Amer. Centr., Rech. Zool., 3(2, livr. 1): 19.
American White-lipped Frog (Dubois and Heyer, 1992, Copeia, 1992: 584).
White-jawed Frog (Ballinger and Lynch, 1983, How to Know Amph. Rept.: XXX).
White-jawed Robber Frog (Wright and Wright, 1938, Trans. Texas Acad. Sci., 21: XXX).
White-lipped Thin-toed Frog (Heyer, Heyer, and de Sá, 2006, Cat. Am. Amph. Rept., 830: 1).
Mexican White-lipped Frog (Schmidt, 1953, Check List N. Am. Amph. Rept., Ed. 6: 60; Conant, Cagle, Goin, Lowe, Neill, Netting, Schmidt, Shaw, Stebbins, and Bogert, 1956, Copeia, 1956: 176; 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., 37:7; Frost, McDiarmid, Mendelson, and Green, 2012, in Crother (ed.), Herpetol. Circ., 39: 16).
White-lipped Frog (Conant, 1975, Field Guide Rept. Amph. E. Cent. N. Am., Ed. 2: 302; Collins, Huheey, Knight, and Smith, 1978, Herpetol. Circ., 7: 11; Liner, 1994, Herpetol. Circ., 23: 25; Lee, 1996, Amph. Rept. Yucatan Peninsula: 68; Lee, 2000, Field Guide Amph. Rept. Maya World: 76;Albert, Hödl, Huber, Ringler, Weish, and Weissenhofer, 2005, Amph. Rept. Golfo Dulce Region Costa Rica: XXX; 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).
Cope's White-lipped Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 81).
White-lipped Foamfrog (Campbell, 1998, Amph. Rept. N. Guatemala Yucatan Belize: 61).
Lower Rio Grande Valley of South Texas (USA) through eastern and southern Mexico (east from Colima) and Central America to western and northern Colombia (south to Cauca) and Venezuela (Sucre).
In the Leptodactylus fuscus group of Heyer, 1978, Sci. Bull. Nat. Hist. Mus. Los Angeles Co., 29: 1-85. Heyer, 1978, Sci. Bull. Nat. Hist. Mus. Los Angeles Co., 29: 31, suggested that Cystignathus labialis Cope, 1878 "1877", was a junior synonym of Leptodactylus mystacinus, and that Leptodactylus fragilis was the appropriate name for this species. This arrangement was rejected by Dubois and Heyer, 1992, Copeia, 1992: 584-585, but reestablished by Heyer, 2002, Proc. Biol. Soc. Washington, 115: 321-322. Virtually all literature regarding this species uses the incorrect name Leptodactylus labialis, which is now a junior synonym of Leptodactylus mystacinus. See accounts (as Leptodactylus labialis) by Heyer, 1971, Cat. Am. Amph. Rept., 104: 1-3; Lee, 1996, Amph. Rept. Yucatan Peninsula: 68-71; Campbell, 1998, Amph. Rept. N. Guatemala Yucatan Belize: 61-62; Lee, 2000, Field Guide Amph. Rept. Maya World: 76-78; Savage, 2002, Amph. Rept. Costa Rica: 221-222; and McCranie and Wilson, 2002, Amph. Honduras: 440-446. Gorzula and Señaris, 1999 "1998", Scient. Guaianae, 8: 58, commented on distribution in Venezuela. Köhler, Vesely, and Greenbaum, 2005 "2006", Amph. Rept. El Salvador: 56-58, provided an account (for El Salvador) and a color photograph. McCranie, 2007, Herpetol. Rev., 38: 38, summarized the departmental distribution in Honduras. Heyer, Heyer, and de Sá, 2006, Cat. Am. Amph. Rept., 830: 1-2, provided a review. Méndez-Narváez, Ospina-Sarria, and Bolívar-García, 2009, Check List, 5: 460-462, provided new records and discussed range in Colombia. See comments by Sunyer, Páiz, Dehling, and Köhler, 2009, Herpetol. Notes, 2: 189-202, regarding Nicaraguan populations. Mata-Silva, Ramírez-Bautista, and Johnson, 2010, Herpetol. Rev., 41: 104, provided a record for eastern Oaxaca, Mexico, and commented on the range.
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