External Morphology and Internal Oral Features of the Tadpole of Crossodactylus caramaschii (Anura: Hylodidae)
We describe the larval external morphology and internal oral features of Crossodactylus caramaschii sampled in protected areas of the Atlantic Forest in southeastern Brazil. The tadpoles of C. caramaschii (Gosner stage 38) have an ovoid body in dorsal view and globular in lateral view, dorsal eyes, a ventral oral disc bordered by a single row of marginal papillae, with a wide gap on the anterior labium, and few and scattered submarginal papillae. The labial tooth row formula is 2(2)/3(1), with A-1 shorter than A-2, and P-3 shorter than P-1 and P-2. This is the first description of the larval morphology of this species and may help future studies on the intrageneric relationships of Crossodactylus. Descrevemos a morfologia externa e a anatomia oral interna das larvas de Crossodactylus caramaschii amostradas em unidades de conservação da Floresta Atlântica do sudeste do Brasil. Os girinos de C. caramaschii (Estágio 38) têm corpo ovóide em vista dorsal e globular em vista lateral, olhos dorsais, aparato oral ventral circundado por uma fileira de papilas marginais, com ampla lacuna no lábio anterior e poucas papilas submarginais dispersas. A fórmula das fileiras de dentes labiais é 2(2)/3(1), sendo A-1 mais curta que A-2 e P-3 mais curta que P-1 e P-2. Esta é a primeira descrição da morfologia larval dessa espécie e pode auxiliar futuros estudos nas relações intragenéricas de Crossodactylus.Abstract
Resumo
(A) State of São Paulo highlighted in Brazil and the localities representing the records of Crossodactylus caramaschii. (B) Maximum Likelihood gene tree for the 16S fragment of Crossodactylus based on GenBank sequences and the sequences from field-collected tadpoles. The star represents the type locality of C. caramaschii (Caverna do Diabo, Eldorado, SP).
Tadpole of Crossodactylus caramaschii, stage 38 (lot 489). (A) Lateral view. (B) Dorsal view. (C) Ventral view. (D) Opened oral disc. (E) Closed oral disc.
Types of nostril in dorsal view (A, reniform; B, semicircular); lateral view of the spiracle (C); and vent tube opening to the right side (D) of tadpoles of Crossodactylus caramaschii (lot 489).
Scanning electron micrograph showing the larval internal oral features of Crossodactylus caramaschii, at Gosner stage 38 (lot 122). (A) Buccal floor. (B) Buccal roof.
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