La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	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
Auteurs :	W. Decraemer, Auteur ; N. Gourbault, Auteur
Type de document :	Article
Dans :	Hydrobiologia (429(1-3) JUN 2000)
Article en page(s) :	25-47
Résumé :	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 mu m, 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.

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