New species of free-living marine nematodes from the Yellow Sea, China

Abstract

Three new species of free-living marine nematodes: Oncholaimus multisetosus sp. nov., Sabatieria stenocephalus sp. nov. and Setosabatieria coomansi sp. nov. from the Yellow Sea, China are described and illustrated. The male of Oncholaimus multisetosus sp. nov. is characterized by a tail sharply constricted at the junction of the conical and cylindrical sections; two circles of 12–15 pairs of circumcloacal setae each. In the female, the conical section of the tail gradually tapers in a cylindrical section. Sabatieria stenocephalus sp. nov. is characterized by the pronounced sharp-pointed anterior body, sclerotized tooth-like front edge of buccal cavity and 15 tubular-shaped precloacal supplements with the posterior five more closely spaced. Setosabatieriacoomansi sp. nov. can be separated from the other species of the genus by the number (6–8) of cervical setae per file, the number of precloacal supplements (15) and the absence of central strips in spicules and leaf-like extensions of the cuticle lateral to the cloaca. Types are deposited in the College of Marine Life Sciences, Ocean University of China.

7.16 Order Plectida Gadea, 1973

“…This is a monotypic family with a single genus Paramicrolaimus and three valid species(Jensen 1978, Huang & Zhang 2005. Precloacal supplements absent.…”

<i>Oncholaimus langhovdensis</i> sp. nov. (Nematoda: Enoplea: Oncholaimida), a New Species of Free-living Marine Nematode from Langhovde, Dronning Maud Land, East Antarctica

“…According to previous studies (Filipjev 1918;Steiner 1921;Ditlevsen 1928;Cobb 1930;Kreis 1932Kreis , 1934Allgén 1935;Gerlach 1958;Allgén 1959;Wieser 1959;Chit- Filipjev 1968;Vitiello 1970;Belogurov et al 1975a, b;Coles 1977;Belogurov and Belogurova 1978;Tsalolikhin 1979;Belogurov and Fadeeva 1980a, b;Smolyanko and Belogurov 1987;Pavlyuk 1991;Smolyanko and Belogurov 1991;Pastor de Ward 1993;Platonova and Kulangieva 1995;Huang and Zhang 2006;Leduc 2008;Shimada et al 2009;Chen and Guo 2014) (Ditlevsen 1930), and the other four species should be transferred to Metoncholaimus Filipjev, 1918 based on the presence of gubernacula (Ditlevsen 1928;Gerlach 1956Gerlach , 1957Allgén 1959) Oncholaimus langhovdensis sp. nov. closely resembles 11 of them based on the conico-cylindrical tails present in males and amphid (posterior half of buccal cavity) and excretory pore positions (2-3 times the buccal cavity length from the anterior body end), the short spicules (1.1-1.3 times abd and 30-40% of the tail length), and Demanian system present in females.…”

Spatial and seasonal variations of subtidal free-living nematode assemblages in the northern Beibu Gulf, South China Sea

“…Nematodes were placed in anhydrous glycerol, mounted on permanent slides (Zhang & Platt, 1983), and identified to genus using a compound microscope (maximum magnification 1000×) and illustrated guides (Platt & Warwick, 1983, 1988; Warwick et al , 1998). Feeding types of marine nematodes were based on the morphology of the buccal cavities.…”