Rhinella pygmaea (Myers & Carvalho)

Oliveira, Marianna Isabella Rosa Rodrigues De, Weber, Luiz Norberto & Napoli, Marcelo Felgueiras, 2013, Internal oral morphology in larvae of the genus Rhinella Fitzinger, 1826 (Amphibia, Anura, Bufonidae), Zootaxa 3745 (5), pp. 501-523 : 510

Rhinella pygmaea (Myers & Carvalho)

Material: three specimens (stage 31, 34, 38).

Buccal floor ( Fig. 4C ): Ovoid buccal floor, wider than long. One pair of large infralabial papillae, concave on the anterior surface, apex with elongated projections and occupying a large part of the oral cavity entrance. There are two small infrarrostral projections on each side. Four digitiform lingual papillae, in equivalent size, rounded apex and arranged in the same transversal plane. The BFA is delimited by nearly 15 digitiform papillae, in different size, tapered apex and nearly 45 pustules distributed between the papillae. There are no structures in the anterior region of the BFA. Laterally to the buccal pockets there is a large and bifurcated papilla. The buccal pockets are transversely oriented. The ventral velum is long and U-shaped; undulated and tumid velar margin, with glandular appearance, constituted by secretory pits and nearly 16 globular projections in the middle portion. Buccal roof ( Fig. 4D ): Ovoid buccal roof, longer than wide. Prenarial arena has an transversal ridge containing four projections at the apex. Large choanae, elliptical and obliquely oriented; the posterior valve is high and the anterior has five prenarial papillae on the inner edge and narial valve projections are present. The distance between the choanae is almost equivalent to median ridge width. The postnarial arena has three papillae on each side, in different size, the most anterior and posterior pairs are conical and the median is digitiform, with smooth surface, tapered apex and arranged forming an inverted " V " design. Before these papillae there are about three pustules. Median ridge is triangular-shaped; flattened and anterior margin irregular. The lateral ridge papillae have the apex wider than the base, flattened, with two or three digitiform secondary branches in different size and anterior margin of the branches with slight irregularities. The most posterior branch is elongated and hook-shaped. The BRA is delimited by three digitiform papillae on each side, elongated; the most anterior pair is conical, tapered apex and aligned on the side of the BRA. There are nearly 30 pustules evenly distributed in the middle region of the BRA. Conspicuous glandular zone, thickened in the middle portion. The dorsal velum is short; undulated margin, with the lateral fold showing a glandular appearance and elongated projections in the middle region.

Figures

FIGURE 4. Scanning electron micrographs of the internal oral morphology. Rhinella pombali (A) floor and (B) roof, stage 34, ZUFRJ 3318; R. pygmaea (C) floor and (D) roof, stage 32, MNRJ 49738; Rhinella schneideri (E) floor and (F) roof, stage 32, DZSJRP 711.1.