Transformations of the axial complex of ophiuroids as a result of shifting of the madreporite to the oral side
- Authors: Ezhova O.V.1,2, Egorova E.A.1, Malakhov V.V.1,2
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Affiliations:
- Faculty of Biology
- Far East Federal University
- Issue: Vol 43, No 6 (2016)
- Pages: 494-502
- Section: Conference Materials
- URL: https://journals.rcsi.science/1062-3590/article/view/181676
- DOI: https://doi.org/10.1134/S1062359016060091
- ID: 181676
Cite item
Abstract
In comparison with Asteroidea, the axial complex of ophiuroids has some important features, which are the result of shifting of the madreporite from the aboral side to the oral side. In contrast to Asteroidea, the stone canal of ophiuroids connects with the water ring from the outside, not from the inside. In Ophiuroidea, the somatocoelomic perihaemal coelom is closer to the mouth than the axocoelomic ring. The water ring of ophiuroids is shifted to the oral side relative to the perihaemal coelomic rings. The genital coelom and gastric haemal ring are located on the outer side of the axial complex, whereas in Asteroidea, they are located on the inner side. The pericardial part of the axial organ is situated on the oral side. The interradial sections of the genital coelom and genital haemal ring are descended to the oral side. Our hypothesis considers that the ancestors of ophiuroids turned the aboral side of the animal to the substratum. It caused shifting of the madreporite to the oral side and closing of the anus.
About the authors
O. V. Ezhova
Faculty of Biology; Far East Federal University
Author for correspondence.
Email: olga.ejova@gmail.com
Russian Federation, Leninskie gory 1, bld. 12, Moscow, 119991; str. Sukhanova 8, Vladivostok, 690950
E. A. Egorova
Faculty of Biology
Email: olga.ejova@gmail.com
Russian Federation, Leninskie gory 1, bld. 12, Moscow, 119991
V. V. Malakhov
Faculty of Biology; Far East Federal University
Email: olga.ejova@gmail.com
Russian Federation, Leninskie gory 1, bld. 12, Moscow, 119991; str. Sukhanova 8, Vladivostok, 690950