Leduc, D., Probert, P.K. & Nodder S.D. (2012). Two new free-living nematode species (Comesomatidae) from the continental slope of New Zealand, with keys and notes on distribution. Zootaxa. 3348, 40-55.
Leduc, D., Probert, P.K. & Nodder S.D.
Two new free-living nematode species (Comesomatidae) from the continental slope of New Zealand, with keys and notes on distribution
Two new free-living marine nematode species of the family Comesomatidae are described from the continental slope of New
Zealand, and their distributions at 32 sites are investigated in relation to environmental factors. Vasostoma aurata n. sp. is characterised
by a distinctly set-off head, amphideal fovea with 4.5 turns, conspicuous chords consisting of two bands fusing at
body extremities, with outline of cell bodies usually golden-coloured, and relatively short spicules. Setosabatieria conicauda n.
sp. is characterised by an amphid with 4.25–4.5 turns, the presence of only 1–3 sub-cephalic setae per file, several clusters of
intracellular inclusions, sometimes brown-coloured, in the intestinal wall, and a conical tail. Keys to all known species of Setosabatieria
and Vasostoma are provided. Both species were mostly restricted to subsurface (1–5cm depth) sediments. The abundance
of V. aurata n. sp. and S. conicauda n. sp. was significantly correlated with food quantity and quality, but the patterns
differed between species. The effect of food-related factors may be directly linked to interspecific differences in food requirements,
or mediated by biogeochemical processes (i.e., tolerance of sub-surface oxygen and sulphide concentrations). No significant
correlations were found between sediment granulometry and abundances, despite the wide range of sediment grain-sizes
(6–93% silt and clay) at the sampling sites.