Rheohyla, Duellman, William E., Marion, Angela B. & Hedges, Blair, 2016

Duellman, William E., Marion, Angela B. & Hedges, Blair, 2016, Phylogenetics, classification, and biogeography of the treefrogs (Amphibia: Anura: Arboranae), Zootaxa 4104 (1), pp. 1-109: 19-20

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new genus

Rheohyla  new genus

Rheohyla  . Type species: Hyla miotympanum Cope, 1863: 47  .

Definition. Medium-sized treefrog (SVL in females to 51 mm) with smooth skin on dorsum, fingers about onethird webbed and toes about three-fourths webbed. Dermal fringes absent on outer edges of forelimbs and feet; prepollex not enlarged ( Fig. 7 AView FIGURE 7. A). Tadpoles being generalized stream inhabitants with a LTRF 2 / 3.

Content. Monotypic; Rheohyla miotympanum  new combination.

Distribution. Eastern Mexico—Cloud forests at elevations of 1000–2800 m on the Atlantic slopes of the Sierra  Madre Oriental; disjunct populations in Sierra  de Los Tuxtlas and on the northern slopes of the highlands of Chiapas.

Etymology. The generic name is a combination of the Greek rheos meaning stream and Hylas  of Greek mythology. The name refers to the breeding site of the species. The gender is feminine.

Remarks. The molecular phylogenetic tree produced by Faivovich et al. (2005) contained one clade with two taxa— Hyla miotympanum  and H. miliaria (Cope)  ; they recognized this clade as a new genus Ecnomiohyla  . However, these authors noted the morphological differences between the species, a factor emphasized by Mendelson et al. (2008), who eliminated E. miotympanum  from their discussion of species of Ecnomiohyla  . The analysis of the 16 S rRNA gene by Batista et al. (2014) resulted in a tree with seven species of Ecnomiohyla  with E. miotympanum  well separated from the other species. In our tree ( Fig. 4View FIGURE 4) there are three species of Ecnomiohyla  plus a well-supported (87 %) long branch to Rheohyla miotympanum  . In contrast to the canopy-dwelling species of Ecnomiohyla  that breeds in tree holes, the sister genus, Rheohyla  , breeds in comparatively slow moving streams, whereas members of the genera Charadrohyla, Plectrohyla  , and Sarcohyla  breed in cascading streams. The tadpoles of Rheohyla  do not have enlarged ventral mouths, whereas species in the other three genera have tadpoles with enlarged ventral mouths with multiple rows of labial papillae.