Three Free-Living Marine Nematodes from Sagami Bay, Japan, with a Description of sp. nov. (Nematoda: Oncholaimidae).

We describe three free-living marine nematode species from Sagami Bay, Japan. sp. nov. is the second species of this genus. It differs from the type species, Inglis, 1966, by its dorsal tooth, which is as long as the other two teeth; its conico-cylindrical tail, which is as long as 4.6-4.8 cloacal body diameters; and the absence of the gubernaculum. cf. de Man, 1889 agrees well with a redescription of de Man, 1889 based on specimens collected near the type locality. However, as it is possible that sensu lato includes two or more species, our species may not be conspecific to sensu stricto. cf. Huang and Wu, 2010 closely resembles Huang and Wu, 2010 originally described from China, but minor differentiations are observed in body diameter, body cuticle thickness, and type of precloacal supplements.