Rhinella schneideri (Werner)

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 : 512

Rhinella schneideri (Werner)

Material: two specimens (stage 32) and two specimens (stage 36)

Buccal floor ( Fig. 4E ): Ovoid buccal floor, wider than long. Two pairs of infralabial papillae; the most anterior pair is short, conical, centralized, with rounded apex; the second pair is large, concave on the anterior surface, apex with elongated projections and occupying a large part of the oral cavity entrance. There are five small infrarrostral projections on each side. Four lingual papillae, in equivalent size, the two lateral ones are bifurcated and the two medians ones are digitiform (forming a " YIIY " design), with bifid apex and arranged on the same transversal plane. The BFA is delimited by nearly 30 digitiform papillae, in different size, tapered apex and nearly 50 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 ( Fig. 5A ) and nearly 12 globular projections in the middle portion. Buccal roof ( Fig. 4F ): Ovoid buccal roof, wider than long. Prenarial arena has a transversal 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 and narial valve projections are present. The distance between the choanae is smaller than the median ridge width. The postnarial arena has five papillae on each side, in different size, the four most posterior papillae are larger, digitiform, with smooth surface, irregular apex, united by the base and transversely aligned; the most anterior papillae are conical and with irregular apex. Median ridge is triangular-shaped; flattened and anterior margin irregular. The lateral ridge papillae have the apex wider than the base, flattened, with three digitiform secondary branches in different size and anterior margin of the branches with slight irregularities. The BRA is delimited by three or four digitiform papillae on each side, elongated, tapered apex or with branches and arranged forming a “ V ” design. 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 ( Fig.5C ) and globular 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.

FIGURE 5. Scanning electron micrographs of the glandular regions on internal oral surface in tadpoles of Rhinella. (A) Velar margin tumid and showing the concentration of secretory pits in R. schneideri; (B) Detail of secretory pits in the margin of the ventral velum of R. arenarum; (C) Concentration of secretory pits on the glandular zone (GZ) and surface of the dorsal velum with glandular appearance (GDV) of R. schneideri.