European Journal of Taxonomy 24: 1-42 ISSN 2118-9773 http://dx.doi.org/10.5852/ejt.2012.24 www.europeanjournaloftaxonomy.eu 2012 · Daniel Leduc This work is licensed under a Creative Commons Attribution 3.0 License. Research article urn:lsid:zoobank.org:pub:F8ED2AA9-83C1-4CB8-8327-58C501B6C42A Deep-sea nematodes (Comesomatidae) from the Southwest Pacific Ocean: five new species and three new species records Daniel LEDUC Department of Marine Science, University of Otago, P.O. Box 56, Dunedin, New Zealand National Institute of Water and Atmospheric Research (NIWA) Limited, Private Bag 14-901, Kilbirnie, Wellington, New Zealand Email:
[email protected] urn:lsid:zoobank.org:author:9393949F-3426-4EE2-8BDE-DEFFACE3D9BC Abstract. The present study describes five new free-living nematode species and provides three new species records of the family Comesomatidae (genera Cervonema Wieser, 1954, Dorylaimopsis Ditlevsen, 1918, Hopperia Vitiello, 1969, and Kenyanema Muthumbi et al., 1997) from the continental margin of New Zealand, Southwest Pacific. Dichotomous identification keys are provided for all known species of Dorylaimopsis and Hopperia. Cervonema shiae Chen & Vincx, 2000 is recorded for the first time outside the type locality (Beagle Channel, Chile). C. kaikouraensis sp. nov. is characterised by amphideal fovea with 5.5 turns situated at 1.7 head diameter from anterior end, jointed outer labial setae, equal in length to cephalic setae, sperm dimorphism, and 5-6 small pre-cloacal supplements. C. multispira sp. nov. is characterised by amphideal fovea with 8.0-8.5 turns situated at 2.6-4.0 head diameter from anterior end, cephalic setae 2-3 μm long, slightly shorter than outer labial setae, presence of six uninucleated cells in males (potentially pseudocoelomocytes or supplementary excretory cells), 5 small pre-cloacal supplements, and strongly cuticularised, arcuate spicules with capitulum.