Hylodes

Weber, Luiz Norberto & Caramaschi, Ulisses, 2013, A survey of the internal oral morphology in larvae of the genus Hylodes Fitzinger, 1826 (Amphibia, Anura, Hylodidae), Zootaxa 3635 (5), pp. 557-568 : 560

Hylodes aff. lateristrigatus (Baumann, 1912)

Material: two specimens (stage 27).

Ventral aspect ( Fig. 3 A): Buccal floor triangular, wider than long; two pairs of infralabial papillae present; the outer pair is longer than wide, has a complex structure with four finger-shaped projections of irregular margin that touch each other; papillae base less discernible; the posterior pair of infralabial papillae with small to medium size, finger-shaped, close to the outer pair, with length slightly lower to the length of the lingual papilla; two filiform lingual papillae present, placed side by side, tapered; lingual papillae closer to the first papilla of the buccal floor arena than to the infralabial papilla; there are about 14–18 papillae on each side, enclosing the buccal floor arena and extending from the region near the tongue rudiments to near the ventral velum; papillae directed to the arena center, finger-shaped and curved; arena papillae arranged similar to a V; the bigger papilla of the floor arena is bifurcate, located in the middle portion of the arena; some arena papillae show irregular margin; about ten small conical papillae placed in posterior portion of the arena surface; about three prepocket papillae, small to mediumsized, similar to those from the buccal floor arena; large number of pustules present on the arena surface, more concentrated in its posterior portion; ventral velum with median notch, not accentuated, undulated margin and about four to six little finger-shaped projections, with medium size, above the glottis.

Dorsal aspect ( Fig. 3 B): Buccal roof triangular, somewhat shaped as the floor; prenarial arena with low crest and shaped as a reversed V, low distinctive in one specimens; reniform choanae, separated and oriented at an angle of 35° in relation to the transverse plane; distance between choanae equal or slightly lower than the width of the median-ridge; pre-choanal papillae not found; postnarial arena with six papillae, arranged on each side in a separate row, papillae with varied sizes and finger-shaped; largest papillae postero-located, finger-shaped, with sharp apex, irregular antero-margin and directed to the center; cluster of papillae in postnarial arena forming an inverted V; complex lateral-ridge papillae, hand-shaped with four to five ramifications of anterior margin finely serrate and directed to the center, the first ramification less developed than the others; the median ridge is triangular-shaped with irregular margin; buccal roof arena bordered by 12-15 papillae on each side, papillae of buccal roof arena finger-shaped, tapered, and with anterior margin aliasing, directed up and to the arena center; absence of large bifurcate papilla in the arena; arena papillae arranged in two, almost parallel lines directed to the center of buccal arena, of varied size on each side; pustules are present and evenly distributed in arena surface; distinct row with about eight lateral papillae on the roof arena; distinct glandular area; dorsal velum medially interrupted, having about ten projections of small to medium size.

Figures

FIGURE 3. (A) Floor and (B) roof of the buccal surface in a Hylodes aff. lateristrigatus tadpoles at stage 27. Scale = 1 mm.