Revisão taxonômica de uma linhagem de Allobates Zimmermann & Zimmermann, 1988 pertencente ao complexo A. albiventris do sudoeste da Amazônia brasileira

Abstract

The nurse frog Allobates albiventris was recently described and inhabits lowland forests in Brazilian southwestern Amazonia. Recent phylogenetic studies have indicated that this species indeed represent a species complex with several unnamed lineages associated with it across southwestern and central Amazonia in Brazil and probably in Bolivia and Peru. Integrative taxonomy was used in the present study to revise one of these lineages from middle Juruá Basin in Brazil. Our multilocus phylogenetic inference recovered the new species in the most basal position within the clade representing the A. albiventris species complex. The new species differs from most congeners by having a call composed of a pair of notes emitted in a single exhalation, such call pattern is a reported within the A. caeruleodactylus clade only for A. albiventris. The advertisement call of the new species is characterized by a call duration of 50 ± 3 ms (43–56 ms), first note (13 ± 3 ms) shorter than the second (19 ± 3 ms); the first note has a dominant frequency of 5,215 ± 138 Hz (4,907–5,440 Hz) and the second note 5,541 ± 160 Hz (5,290–5,825 Hz). Adults have a tuberculate to granulate dorsum, SVL 16.4 ± 0.57 mm in males and 17.3 ± 0.4 mm in females, fingers II and III swollen in males, a white vocal sac without melanophores. Tadpoles have two to four short, rounded papillae distributed in a single row on each lateral margin of the anterior lip; relative length of the tooth rows P2>P1>P3 (P1 = 0.93 ± 0.10 mm; P2 = 0.91 ± 0.06 mm; and P3 = 0.90 ± 0.15 mm).