Hypothesis: A new anteroposterior axis for non-radiate early echinoderms
1
Institute for Sports Science, University of Münster, Münster, Germany
2
Otto Creutzfeldt Center for Cognitive and Behavioral Neuroscience, University of Münster, Münster, Germany
- Published
- Accepted
- Subject Areas
- Developmental Biology, Evolutionary Studies, Paleontology
- Keywords
- Echinoderm paleontology, asymmetry, evo-devo, homalozoan, stylophoran, homostelean, homoiostelea, theory
- Copyright
- © 2016 de Lussanet
- Licence
- This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ Preprints) and either DOI or URL of the article must be cited.
- Cite this article
- 2016. Hypothesis: A new anteroposterior axis for non-radiate early echinoderms. PeerJ Preprints 4:e2009v1 https://doi.org/10.7287/peerj.preprints.2009v1
Abstract
Homalozoa are a weird group of echinoderms, for their complete lack of radiate symmetry. Indeed, they are typified by their tendency to marked asymmetric body forms. It has been proposed that they asymmetric forms evolved from bilaterally symmetric ones, but so far, only approximately bilaterally symmetric forms have been described (Robinson & Sprinkle 1969;Zamora 2012). Hypothesis: Homalozoans developed from bilaterally symmetric, tropartite larvae, by adopting a secondary anteroposterior axis.
Author Comment
This is a hypothesis presented as a poster on the Conference "Progress in Echinoderm Palaeobiology" (PEP), Spain, 2015. It will not be published elsewhere, but a full paper is planned.