New deep-sea free-living marine nematodes from the Sea of Japan: the genera Siphonolaimus and Halichoanolaimus (Nematoda: Chromadorea) with keys to species identifications Author Julia, Zograf Author Yulia, Trebukhova Author Olga, Pavlyuk text Zootaxa 2015 3911 1 63 80 journal article 36740 10.11646/zootaxa.3911.1.3 072e7072-fb31-45ac-9b48-616fe14684e2 1175-5326 287686 1F69EB9B-62F6-4D27-B773-749F292E4A05 Genus Siphonolaimus De Man , 1893 Diagnosis (emended from Warwick et al . 1998 ): Siphonolaiminae. Cuticle striated. Buccal cavity containing an axial cuticularized spear-like structure. Six outer labial setae and four cephalic setae situated more or less at the same level, the six always shorter than the four. Amphids circular. One anterior outstretched ovary. Single anterior testis. Gonad always lies to the left of intestine.