Comparative internal anatomy of Staurozoa (Cnidaria), with functional and evolutionary inferences

Autor(es)

Miranda, Lucilia S. ; Collins, Allen G. ; Hirano, Yayoi M. ; Mills, Claudia E. ; Marques, Antonio C.

• Tipo de documento: Artigo Científico
• Fonte: PeerJ; v. 4, OCT 27 2016.
• Citações Web of Science: 4

Resumo

Comparative efforts to understand the body plan evolution of stalked jellyfishes are scarce. Most characters, and particularly internal anatomy, have neither been explored for the class Staurozoa, nor broadly applied in its taxonomy and classification. Recently, a molecular phylogenetic hypothesis was derived for Staurozoa, allowing for the first broad histological comparative study of staurozoan taxa. This study uses comparative histology to describe the body plans of nine staurozoan species, inferring functional and evolutionary aspects of internal morphology based on the current phylogeny of Staurozoa. We document rarely-studied structures, such as ostia between radial pockets, intertentacular lobules, gametoducts, pad-like adhesive structures, and white spots of nematocysts (the last four newly proposed putative synapomorphies for Staurozoa). Two different regions of nematogenesis are documented. This work falsifies the view that the peduncle region of stauromedusae only retains polypoid characters; metamorphosis from stauropolyp to stauromedusa occurs both at the apical region (calyx) and basal region (peduncle). Intertentacular lobules, observed previously in only a small number of species, are shown to be widespread. Similarly, gametoducts were documented in all analyzed genera, both in males and females, thereby elucidating gamete release. Finally, ostia connecting adjacent gastric radial pockets appear to be universal for Staurozoa. Detailed histological studies of medusozoan polyps and medusae are necessary to further understand the relationships between staurozoan features and those of other medusozoan cnidarians. (AU)

• Processo FAPESP: 13/50484-4 - Biodiversity and distribution patterns of the Medusozoa form the South-Western Atlantic
• Beneficiário: Antonio Carlos Marques
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/07362-7 - Evolução em Staurozoa: subsídios moleculares, morfológicos, de cnidoma e desenvolvimento
• Beneficiário: Lucília Souza Miranda
• Linha de fomento: Bolsas no Brasil - Doutorado
• Processo FAPESP: 15/23695-0 - Relações de homologia em Medusozoa (Cnidaria) com base na anatomia dos diferentes estágios do ciclo de vida
• Beneficiário: Lucília Souza Miranda
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 11/50242-5 - Dimensões da vida marinha: padrões e processos de diversificação em cnidários planctônicos e bentônicos
• Beneficiário: Antonio Carlos Marques
• Linha de fomento: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 10/52324-6 - Síntese e lacunas do conhecimento sobre os organismos da zona costeiro-marinha brasileira
• Beneficiário: Antonio Carlos Marques
• Linha de fomento: Auxílio à Pesquisa - Programa BIOTA - Regular