Tadpole morphology, advertisement call and natural history notes of Ololygon muriciensis (Anura: Hylidae: Scinaxini)

Ololygon muriciensis, a rare species of the O. catharinae group, is known to occur in a single locality in the Atlantic Forest of Brazil. Despite its morphological resemblance and close phylogenetic relationship to O. strigilata, molecular evidence supports them as separate taxa. This study aims to expand the understanding of O. muriciensis through a description of its larval internal and external morphology, advertisement call, and natural history. Our study reveals that larvae of this species share typical external larval characteristics with other species of Ololygon. The analysis of the advertisement call of O. muriciensis reveals a unique note with spectral and temporal structures similar to type A calls or the first note in complex calls observed in other Ololygon species. Both larvae and call of O. muriciensis bear resemblance to those of O. strigilata. However, given the taxonomic challenges associated with nontopotypical populations of O. strigilata, further studies focusing on this species are necessary to clarify the taxonomic status of both O. muriciensis and O. strigilata.