A new species of subantarctic Plexechinus and its phylogenetic position within the Holasteroida (Echinodermata: Echinoidea) |
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| Authors: | Bruno David Rich Mooi |
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| Affiliation: | (1) UMR CNRS 5561, University of Bourgogne, 6, bd. Gabriel, F-21000 Dijon, France e-mail: bruno.david@u-bourgogne.fr Tel.: +33-3-80396371, Fax: +33-3-80396387, FR;(2) Department of Invertebrate Zoology and Geology, California Academy of Sciences, Golden Gate Park, San Francisco, CA 94118-4599, USA, US |
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| Abstract: | A seventh species of Plexechinus, Plexechinus sulcatus sp. nov., is described from material collected at 585 m from an R/V “Marion Dufresne” station northwest of the Kerguelen Islands. It differs most markedly from its congeners in possessing a distinctive aboral sulcus in the anterior ambulacrum, which is unique in the Plexechinidae. There is strong phylogenetic evidence that P. sulcatus is the sister group to a clade containing P. cinctus and P. hirsutus. The implications of this placement are discussed in the light of previous work on the evolutionary biology of holasteroids. Accepted: 11 September 1999 |
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