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Type: Articles
Published: 2012-03-15
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The taxonomic status of Melanophryniscus orejasmirandai Prigioni & Langone, 1987 "1986" (Anura: Bufonidae)

Instituto de Herpetología, Fundación Miguel Lillo, Miguel Lillo 251, 4000 San Miguel de Tucumán, Argentina Laboratorio de Genética Evolutiva, Facultad de Ciencias Exactas, Químicas y Naturales, Universidad Nacional de Misiones, Félix de Azara 1552, 3300 Posadas, Misiones, Argentina
Sección Herpetología. Museo Nacional de Historia Natural, 25 de Mayo 582, Montevideo, Uruguay
Sección Herpetología. Museo Nacional de Historia Natural, 25 de Mayo 582, Montevideo, Uruguay
Sección Herpetología, Museo de La Plata, Universidad Nacional de La Plata, Paseo del Bosque S/Nº, (1900) La Plata, Buenos Aires, Argentina
Sección Herpetología. Museo Nacional de Historia Natural, 25 de Mayo 582, Montevideo, Uruguay
Sección Bioquímica, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
Hemichordata geographic distribution Melanophryniscus orejasmirandai Melanophryniscus pachyrhynus osteology taxonomy

Abstract

Melanophryniscus orejasmirandai is a species of toad known only from two localities in southern Uruguay. This toad isthe southernmost suggested taxon of the M. tumifrons group, whose species are characterized by a glandular frontal swell-ing on the snout. The study of the type series of M. orejasmirandai and of M. pachyrhynus, along with observations madeon many specimens of both species suggested a close relationship between them. The analysis of the variation of snout-vent length, coloration pattern, relative size of the frontal swelling, and presence/absence of the metatarsal gland showedthat characters previously used to separate both species resulted of no diagnostic value. Further comparison of the externalmorphology, osteological characters, and partial sequences of the cytochrome b gene indicated that M. orejasmirandai isa junior synonym of M. pachyrhynus. Melanophryniscus pachyrhynus is characterized by a reticulated orange ventral pat-tern which is shared only with M. peritus, from which it differs by its smaller size. The ornamentation of the nasal bonesunderlying the frontal swelling in M. pachyrhynus seems to be characteristic of the M. tumifrons group. An updated distribution map of M. pachyrhynus and some new localities are also provided.

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