Marine & Environmental Sciences Faculty Articles

The Genera and Species of Comatulidae (Comatulida: Crinoidea): Taxonomic Revisions and a Molecular and Morphological Guide

Document Type

Article

Publication Title

Zootaxa

ISSN

1175-5326

Publication Date

5-16-2017

Keywords

Comasteridae, Crinoid, Feather star, Taxonomy, Shallow-water crinoids, Echinodermata crinoidea, Myzostomida annelida, Fauna echinodermata, Marshall Islands, Pacific

Abstract

We provide a guide for identification of Comatulidae, a family of crinoid echinoderms, incorporating morphological and molecular evidence. A non-dichotomous key for all genera is included, as well as photographs of species most likely to be encountered in the tropical western Pacific Ocean. Based on sequencing of cytochrome oxidase subunit I (COI), and other genes when necessary, we identified four cases where taxonomic revision was needed. We synonymized Comaster nobilis under Comaster schlegelii, and Clarkcomanthus exilis under Clarkcomanthus comanthipinnus, and re-described Clarkcomanthus albinotus. We also showed the variation of COI sequences within and among species, which varies from lineage to lineage. In some cases, specimens with obvious morphological disparity possessed very little intraspecific molecular diversity (<1%). In others, specimens with nearly identical external appearances exhibited quite divergent COI sequences (up to 6%). These results, combined with the non-dichotomous key herein, offer guidelines for identification and discussion of existing and new species of Comatulidae.

DOI

10.11646/zootaxa.4268.2.1

Volume

4268

Issue

2

First Page

151

Last Page

190

Comments

©2017 Magnolia Press

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Peer Reviewed

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