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Dysponetus joeli sp. nov. (Polychaeta: Chrysopetalidae) from the north-east Atlantic, with a cladistic analysis of the genus and a key to species

Published online by Cambridge University Press:  22 May 2012

Frederic Olivier ,
Paulo Lana ,
Veronica Oliveira  and
Tim Worsfold
Frederic Olivier*
Affiliation:
Muséum National d'Histoire Naturelle, Département Milieux et Peuplements Aquatiques, UMR 7208 BOREA MNHN/CNRS/P6/IRD
Paulo Lana
Affiliation:
Centro de Estudos do Mar–Universidade Federal do Paraná, Avenida Beira-Mar s/n, CEP 83255-976, Pontal do Sul, Paraná, Brazil
Veronica Oliveira
Affiliation:
Centro de Estudos do Mar–Universidade Federal do Paraná, Avenida Beira-Mar s/n, CEP 83255-976, Pontal do Sul, Paraná, Brazil
Tim Worsfold
Affiliation:
Thomson Unicomarine Ltd, 7 Diamond Centre, Works Road, Letchworth, Hertfordshire, SG6 1LW, UK, and Canterbury Christ Church University, North Holmes Road, Canterbury, Kent, CT1 1QU, UK
*
Correspondence should be addressed to: F. Olivier, ISMER/UQAR, 310, allée des Ursulines, CP 3300 Rimouski QCCanadaG5L 3A email [email protected]
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Abstract

We describe Dysponetus joeli sp. nov. from shallow maerl habitats in the north-east Atlantic (English Channel and Bay of Biscay). Dysponetus joeli differs from congeneric species by a unique combination of characters, including a large syllid-like pharynx, 2–4 simple serrated neurochaetae (closely similar to notochaetae, but much smaller and more delicate), D-shaped chaetal spines and ventral cirri on the third segment. A phylogenetic parsimony analysis based on morphological traits suggests that Dysponetus is not monophyletic unless it includes the closely related genera Vigtorniella and Pseudodysponetus, which are well delineated inside the dysponetid clade. Chaetal spines seem to be secondarily derived from paleae and to have originated in infaunal dysponetid forms. They should not be considered as plesiomorphic, but as evidence to support the clade made up by Dysponetus–Vigtorniella and Pseudodysponetus as delineated by a phylogenetic analysis.

Keywords

PolychaetaChrysopetalidaeDysponetusEnglish ChannelChausey ArchipelagoCornwallBay of Biscayphylogenymaerl
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 92 , Issue 5 , August 2012 , pp. 989 - 996
Copyright
Copyright © Marine Biological Association of the United Kingdom 2012

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