Title

A Revision of the Zenometridae (new rank) (Echinodermata, Crinoidea, Comatulidina)

Document Type

Article

Publication Date

12-21-2001

Publication Title

Zoologica Scripta

Keywords

Stalked crinoids, Echinodermata

ISSN

0300-3256

Volume

30

Issue/No.

3

First Page

159

Last Page

180

Abstract

Three genera of unstalked crinoids, Zenometra, Sarametra and Psathyrometra, formerly included in the subfamily Zenometrinae of the family Antedonidae, are removed and placed in a distinct family, the Zenometridae. Diagnostic features include a cavernous centrodorsal cavity, a complete basal circlet with a large central lumen and cirrus sockets with a concave fulcral bowl around the lumen. Sarametra nicobarica is synonymized under S. triserialis, which is redescribed in detail. Psathyrometra is redefined and includes only the species P. fragilis, P. congesta and P. bigradata, which are redescribed. P. erythrizon is synonymized under P. fragilis. The four other species formerly included in Psathyrometra are removed to Athrypsometra gen. n., retained in the Antedonidae. The other genera formerly included in the Zenometrinae are considered incertae sedis in the family Antedonidae pending detailed re-examination. Cladistic analysis using the antedonids, Poliometra prolixa (a former zenometrine) and Florometra serratissima, and the thalassometrid, Oceanometra annandalei, as outgroups produces the following tree: (O. annandalei((F. serratissima/P. prolixa)(((P. fragilis/P. congesta)P. bigradata) (S. triserialis/Z. columnaris)))).

Comments

©The Norwegian Academy of Science and Letters

DOI

10.1046/j.1463-6409.2001.00062.x

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Peer Reviewed

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