Microhyla mazatlanensis Taylor, 1943, Univ. Kansas Sci. Bull., 29: 355. Holotype: EHT-HMS 1236, by original designation; now FMNH 100040 according to Marx, 1976, Fieldiana, Zool., 69: 59. Type locality: "two miles east of Mazatlán, Sinaloa", Mexico.
Microhyla carolinensis mazatlanensis — Hecht and Matalas, 1946, Am. Mus. Novit., 1315: 5-7. ; Carvalho, 1954, Occas. Pap. Mus. Zool. Univ. Michigan, 555: 13.
Microhyla olivacea mazatlanensis — Langebartel and Smith, 1954, Herpetologica, 10: 126.
Gastrophryne olivacea mazatlanensis — Chrapliwy, Williams, and Smith, 1961, Herpetologica, 17: 89.
Gastrophryne mazatlanensis — Streicher, Cox, Campbell, Smith, and de Sá, 2012, Mol. Phylogenet. Evol., 64: 645-653.
Sinaloa Narrow-mouthed Toad (Schmidt, 1953, Check List N. Am. Amph. Rept., Ed. 6: 77; Conant, Cagle, Goin, Lowe, Neill, Netting, Schmidt, Shaw, Stebbins, and Bogert, 1956, Copeia, 1956: 176; Stebbins, 1966, Field Guide W. North Am. Rept. Amph.: 78).
Sinaloan Narrow-mouthed Toad (Stebbins, 1985, Field Guide W. Rept. Amph., Ed. 2: 95).
Mazatlan Narrowmouth Toad (Liner, 1994, Herpetol. Circ., 23: 22; Liner and Casas-Andreu, 2008, Herpetol. Circ., 38: 14).
South-central Arizona and southwestern New Mexico (USA) to Nayarit (Mexico) along the coastal plain.
Removed from the synonym of Gastrophryne olivacea by Streicher, Cox, Campbell, Smith, and de Sá, 2012, Mol. Phylogenet. Evol., 64: 645-653, where it had been placed by Hecht and Matalas, 1946, Am. Mus. Novit., 1315: 5-7, although Stebbins, 1985, Field Guide W. Rept. Amph., Ed. 2: 95, treated it as a distinct subspecies.
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