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Hydrobiologia

, Volume 429, Issue 1–3, pp 25–47 | Cite as

New species of Metepsilonema (Nemata, Epsilonematidae) from the Channel and the Mediterranean Sea with a polytomous key for the identification of species of the genus

  • Wilfrida Decraemer
  • Nicole Gourbault
Article

Abstract

Four new species of Metepsilonema are described from sublittoral stations from the Channel and are mainly characterized: M. volutum sp.nov. by the large body size for the genus up to 460 μm, 118–121 well overlapping annuli and wide multispiral amphids; M. amphidoxum sp.nov. by 127–133 shortly overlapping annuli and sexual dimorphism in amphid size; M. comptum sp.nov. by 133–140 non-overlapping annuli, anteriormost annuli provided with a wide lumen and borders ornamented with ridges and M. corrugatum sp.nov. by 108–111 overlapping annuli provided with ridges). Additional information is provided for M. callosum together with a discussion on intraspecific variability. A new species of Metepsilonema spec. based on females only, is described but remain unnamed. M. comptum sp.nov. and M. corrugatum sp.nov. are also occurring in the Mediterranean Sea. A polytomous key to species level is presented.

marine nematodes Epsilonematidae Metepsilonema taxonomy key to species 

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  1. 1.Koninklijk Belgisch Instituut voor NatuurwetenschappenBrusselsBelgium
  2. 2.Biologie des Invertébrés marinsMuséum national d'Histoire naturelleParis cedex 05France

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