Engystoma pictiventre Cope, 1886, Proc. Am. Philos. Soc., 23: 272. Holotype: USNM 14196 according to Cochran, 1961, Bull. U.S. Natl. Mus., 220: 48. Type locality: "Nicaragua"; restricted by Savage, 1973, J. Herpetol., 7: 37, to "between El Castillo and San Juan del Norte along the Río San Juan . . . Departamento Río San Juan, Nicaragua".
Gastrophryne pictiventris — Stejneger, 1910, Proc. Biol. Soc. Washington, 23: 166. Carvalho, 1954, Occas. Pap. Mus. Zool. Univ. Michigan, 555: 1-19.
Engystoma pictiventris — Nieden, 1926, Das Tierreich, 49: 64.
Microhyla pictiventris — Parker, 1934, Monogr. Frogs Fam. Microhylidae: 126.
Hypopachus pictiventris — Streicher, Cox, Campbell, Smith, and de Sá, 2012, Mol. Phylogenet. Evol., 64: 645-653.
Nicaragua Narrowmouth Toad (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 89).
Southern Narrow-mouthed Toad (Ananjeva, Borkin, Darevsky, and Orlov, 1988, Dict. Amph. Rept. Five Languages: 96).
Lowlands of southeastern Nicaragua and northeastern Costa Rica.
Reviewed by Nelson, 1973, Cat. Am. Amph. Rept., 135: 1-2. See account by Savage, 2002, Amph. Rept. Costa Rica: 393-394. See comments by Sunyer, Páiz, Dehling, and Köhler, 2009, Herpetol. Notes, 2: 189-202, regarding Nicaraguan populations. Streicher, Cox, Campbell, Smith, and de Sá, 2012, Mol. Phylogenet. Evol., 64: 645-653, demonstrated that Gastrophryne was paraphyletic with respect to Hypopachus and remedied this with the transfer of Gastrophryne pictiventris and Gastrophryne elegans to Hypopachus.
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