Excerpt from A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope

Hands and F eat - Taylor and Smith Smith and Taylor Firschein (1954) and Duellman (1958) discussed the value of the palmar tubercles in identifying frogs of this genus. The eastern complex in general has a well-developed Outer palmar tubercle (fig. 1) in distinction to the western complex in which the outer palmar tubercle is reduced or absent (fig. Dixon and Webb (1966) imply that the outer palmar tubercle is rarely absent but is usually smaller than the first supernumerary tubercle Of the fourth finger. My study of the western species demonstrates that the outer palmar tubercle is indeed usually present and smaller than the first supernumerary tubercle.

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