Análise comparativa da morfologia externa, morfologia oral interna, condrocrânio e aparelho hiobranquial de larvas do gênero Elachistocleis Parker 1927 (Anura, Microhylidae)

Abstract

The gender Elachistocleis Parker in 1927 consists of 17 species , and of these, seven have the external morphology described and two have the internal oral morphology and the chondrocranium of its larvae described. Lack of descriptive works that contribute to the knowledge of the tadpoles of Elachistocleis is the justification of this work. Therefore, the goal of this work was to characterize the external morphology, internal oral morphology, chondrocranium and hiobranquial apparatus of tadpoles of Elachistocleis, comparing them with each other and with other species described in the literature. We used E. bumbameuboi, E. cf. piauiensis, E. cesarii and E. bicolor between 31-39 of Gosner stage . The external morphology of Elachistocleis is conservative in many aspects. Differences found were: Body format in dorsal view; edge of dermal flaps; snout edge in dorsal view; emergency angle of the dorsal fin in the body; lateral line visible or not; pustules pattern on the posterior region of the median ridge; pronunciation of the projection in the anterior medial margin of the suprarostral corpus; posterior margin of the suprarostral alae in W-shaped or not; ventral margin of the fenestra in the occipital region slightly or clearly wavy; presence of fenestra hypophyseos; margin of the thin process in the articular process; Presence of finger-like expansions in the ventrolateral process; shape and inclinatione of the subocular fenestra; subótico process single or slightly bifid; inclination of the anterolateral process. The comparative study corroborates with most of the characteristics observed in descriptive works published for the gender Elachistocleis and for other species of Microhylidae from the Old and New World.