The vocal sac of Hylodidae (Amphibia, Anura): Phylogenetic and functional implications of a unique morphology

Autor(es)

Elias-Costa, Agustin J. ^[1] ; Montesinos, Rachel ^[2] ; Grant, Taran ^{[3, 2]} ; Faivovich, Julian ^[1]

Afiliação do(s) autor(es)

^[1] Museo Argentino Ciencias Nat Bernardino Rivadavia, Div Herpetol, Ave Angel Gallardo 470, C1405DJR, Buenos Aires, DF - Argentina

^[2] Univ Sao Paulo, Dept Zool, Inst Biociencias, Rua Matao, Travessa 14, 321, Cidade Univ, BR-05508090 Sao Paulo, SP - Brazil

^[3] Univ Sao Paulo, Museu Zool, BR-04263000 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Morphology; v. 278, n. 11, p. 1506-1516, NOV 2017.
• Citações Web of Science: 3

Resumo

Anuran vocal sacs are elastic chambers that recycle exhaled air during vocalizations and are present in males of most species of frogs. Most knowledge of the diversity of vocal sacs relates to external morphology; detailed information on internal anatomy is available for few groups of frogs. Frogs of the family Hylodidae, which is endemic to the Atlantic Forest of Brazil and adjacent Argentina and Paraguay, have three patterns of vocal sac morphology-that is, single, subgular; paired, lateral; and absent. The submandibular musculature and structure of the vocal sac mucosa (the internal wall of the vocal sac) of exemplar species of this family and relatives were studied. In contrast to previous accounts, we found that all species of Crossodactylus and Hylodes possess paired, lateral vocal sacs, with the internal mucosa of each sac being separate from the contralateral one. Unlike all other frogs for which data are available, the mucosa of the vocal sacs in these genera is not supported externally by the mm. intermandibularis and interhyoideus. Rather, the vocal sac mucosa projects through the musculature and is free in the submandibular lymphatic sac. The presence of paired, lateral vocal sacs, the internal separation of the sac mucosae, and their projection through the m. interhyoideus are synapomorphies of the family. Furthermore, the specific configuration of the m. interhyoideus allows asymmetric inflation of paired vocal sacs, a feature only reported in species of these diurnal, stream-dwelling frogs. (AU)

• Processo FAPESP: 12/10000-5 - Uma abordagem multidisciplinar para o estudo da diversificação de anfíbios
• Beneficiário: Taran Grant
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 14/04077-0 - Análise morfológica comparativa das rãs de corredeiras (Anura: Hylodidae)
• Beneficiário: Rachel Montesinos Martins Pereira
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 12/22566-3 - Sistemática Filogenética de Hylodidae Gunther 1858(Amphibia: Anura)
• Beneficiário: Rachel Montesinos Martins Pereira
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/50741-7 - Diversidade e conservação dos anfíbios brasileiros
• Beneficiário: Célio Fernando Baptista Haddad
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático