| Full text | |
| Author(s): |
Miranda, Lucilia S.
;
Collins, Allen G.
;
Hirano, Yayoi M.
;
Mills, Claudia E.
;
Marques, Antonio C.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | PeerJ; v. 4, OCT 27 2016. |
| Web of Science Citations: | 4 |
| Abstract | |
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) | |
| FAPESP's process: | 10/07362-7 - Evolution in Staurozoa: molecular, morphological, cnidome and developmental subsidies |
| Grantee: | Lucília Souza Miranda |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 11/50242-5 - Dimensions of marine life: patterns and process of diversifications in planktonic and benthic cnidarians |
| Grantee: | Antonio Carlos Marques |
| Support Opportunities: | BIOTA-FAPESP Program - Thematic Grants |
| FAPESP's process: | 13/50484-4 - Biodiversity and distribution patterns of the Medusozoa form the South-Western Atlantic |
| Grantee: | Antonio Carlos Marques |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 15/23695-0 - Homology relationships in Medusozoa (Cnidaria) based on the anatomy of the different stages of the life cycle |
| Grantee: | Lucília Souza Miranda |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 10/52324-6 - Síntese e lacunas do conhecimento sobre os organismos da zona costeiro-marinha brasileira |
| Grantee: | Antonio Carlos Marques |
| Support Opportunities: | BIOTA-FAPESP Program - Regular Research Grants |