Rhinella abei (Baldissera, Caramaschi & Haddad)

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 : 502

Rhinella abei (Baldissera, Caramaschi & Haddad)

Material: two specimens (stage 36, 37).

Buccal floor ( Fig. 1A ): Ovoid buccal floor, wider than long. A pair of large infralabial papillae, concave on the anterior surface, apex with elongated projections and occupying a large part of the oral cavity entrance. Infrarrostral projections are absent. Four lingual papillae, digitiform, in equivalent size, with rounded apex and arranged on the same transversal plane. The buccal floor arena ( BFA) is delimited by nearly 45 digitiform papillae in different size, with smooth surface, tapered apex and nearly 40 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 margin, with glandular appearance, constituted by secretory pits and nearly ten globular projections in the middle portion. Buccal roof ( Fig. 1B ): Ovoid buccal roof, longer than wide. Prenarial arena has a sinuous ridge and irregular apex. Large choanae, elliptical and obliquely oriented; the posterior valve is high and the anterior has three prenarial papillae on the inner edge. The distance between the choanae is almost equivalent to median ridge width. The postnarial arena has 3 papillae on each side, in different size, the two most anterior are conical with irregular apex and the most posterior is larger, with three digitiform branches, tapered apex and transversely aligned. Median ridge is trapezoid or triangular-shaped (stage 36 and 37 respectively); dorsoventrally flattened and anterior margin irregular. The lateral ridge papillae have the apex as wide as the base, flattened, with three digitiform secondary branches in different size and the anterior margin of the branches with slight irregularities. The buccal roof arena ( BRA) is delimited laterally by four to six digitiform papillae on each side, elongated, in different size, tapered apex and arranged on the side. There are nearly ten 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 irregular margin in the middle region, without projections.

Figures

FIGURE 1. Scanning electron micrographs of the internal oral morphology. R. abei (A) floor and (B) roof, stage 36, DZSJRP 908.1; R. arenarum (C) floor and (D) roof, stage 38, MNRJ 44936; R. crucifer (E) floor and (F) roof, stage 35, UFBA 0107. IP, infralabial papillae; LP, lingual papillae; BP, buccal pocket; BFA, buccal floor arena; BFAP, buccal floor arena papillae; VV, ventral velum; PRA, prenarial arena; CH, choanae; POA, postnarial arena; LRP, lateral ridge papillae; MR, median ridge; BRA, buccal roof arena; BRAP, buccal roof arena papillae; GZ, glandular zone; DV, dorsal velum.