| Texto completo | |
| Autor(es): |
Rupp, Guilherme Sabino
;
Martins, Luciana
;
Souto, Camilla
;
Hamel, Jean-Francois
;
Mercier, Annie
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | NVERTEBRATE BIOLOG; v. 143, n. 3, p. 12-pg., 2024-06-21. |
| Resumo | |
The present study explores rare but taxonomically and geographically widespread cases of anterior body axial bifurcation in adult sea cucumbers (Echinodermata: Holothuroidea). One individual of Holothuria (Halodeima) grisea, a common intertidal species along the Atlantic coast of Brazil, was studied externally and internally. Individuals of Apostichopus californicus from the northeastern Pacific coast of Washington (USA), H. (Mertensiothuria) leucospilota in the Indian Ocean off La R & eacute;union, H. (Panningothuria) forskali from the Atlantic coast of Spain, and Parastichopus tremulus from the northeastern Atlantic off Norway were also reported to display similar anterior body axial bifurcation. In each of these species, the anterior body presented two mouths with their respective crown of tentacles. In vivo observations of H. (Halodeima) grisea showed that the two tentacle crowns and mouths were independently functional. Micro-computed tomography (mu CT) revealed that the anterior region of the body (up to the pharynx) was duplicated. Internally, two aquapharyngeal bulbs were found, each with their own calcareous ring (one with two plates missing), madreporite, and Polian vesicles. The body presented a normal set of five longitudinal muscle bands, some of which bifurcated orally to support more than one calcareous ring plate. This is the first report of such abnormalities in Holothuroidea and hypotheses that may explain such phenomenon are discussed. (AU) | |
| Processo FAPESP: | 21/06442-1 - Paleobiologia da conservação: Holothuroidea (Echinodermata) como indicadores de mudanças climáticas ao longo do Holoceno na Bacia de Campos, Atlântico Sul |
| Beneficiário: | Luciana Ribeiro Martins |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |