The genera and species of Comatulidae (Comatulida: Crinoidea): taxonomic revisions and a molecular and morphological guide

TitleThe genera and species of Comatulidae (Comatulida: Crinoidea): taxonomic revisions and a molecular and morphological guide
Publication TypeJournal Article
Year of Publication2017
AuthorsSummers M.M, Messing CG, Rouse GW
JournalZootaxa
Volume4268
Pagination151-190
Date Published2017/05
Type of ArticleArticle
ISBN Number1175-5326
Accession NumberWOS:000401427500001
Keywordsclark,a.h.; Comasteridae; crinoid; echinodermata crinoidea; fauna echinodermata; feather star; genus; marshall-islands; myzostomida annelida; pacific; shallow-water crinoids; taxonomy
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.

DOI10.11646/zootaxa.4268.2.1
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