| Autor: |
Oliveira MIRR; Universidade Federal da Bahia, Programa de Pós-Graduação em Biodiversidade e Evolução, Instituto de Biologia, Campus Universitário de Ondina, Rua Barão de Jeremoabo, s/n, Ondina, 40170-115 Salvador, BA, Brazil., Grosso J; Unidad Ejecutora Lillo - CONICET-FML, Miguel Lillo 251, 4000 San Miguel de Tucumán, Argentina.; Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, Independencia 631, 5090000 Valdivia, Chile.; Centro de Humedales Río Cruces (UACh), Independencia 631, 5090000 Valdivia, Chile., Napoli MF; Universidade Federal da Bahia, Programa de Pós-Graduação em Biodiversidade e Evolução, Instituto de Biologia, Campus Universitário de Ondina, Rua Barão de Jeremoabo, s/n, Ondina, 40170-115 Salvador, BA, Brazil., Weber LN; Universidade Federal da Bahia, Programa de Pós-Graduação em Biodiversidade e Evolução, Instituto de Biologia, Campus Universitário de Ondina, Rua Barão de Jeremoabo, s/n, Ondina, 40170-115 Salvador, BA, Brazil.; Universidade Federal do Sul da Bahia, Centro de Formação em Ciências Ambientais, BR 367, Rodovia Porto Seguro-Eunápolis, Km 10, 45810-000 Porto Seguro, BA, Brazil., Candioti FV; Unidad Ejecutora Lillo - CONICET-FML, Miguel Lillo 251, 4000 San Miguel de Tucumán, Argentina. |
| Abstrakt: |
We studied the relationship between shape, size, and developmental time in the embryonic ontogeny of 15 species of the frog genus Physalaemus. As in other anuran exotrophic embryos, shape changes are correlated with size increase and mainly concern tail elongation, decrease in body height, and increase in fin height. Size ranges and developmental times vary interspecifically. Embryos of the P. signifer Clade and the P. gracilis Group are among the largest, are slightly peramorphic, and develop fast regarding congeneric species. Embryos of P. cicada combine the smallest sizes with fast development and the most peramorphic shapes. The paedomorphic shapes of embryos of P. biligonigerus and P. henselii groups are correlated with fast vs. slow developmental times respectively. Trajectories in the P. cuvieri Group are diverse and in general differ in size and developmental time. The embryos of P. cristinae and from the Argentinean lineage of P. cuvieri stand out with the longest development. Sequences of developmental events are overall conserved in the genus, and main differences concern mouthpart ontogeny. This study constitutes the first attempt to evaluate morphological, allometric, and heterochronic parameters of the early ontogeny of anurans and how these can vary and contribute to diversification in taxonomic groups. |
