New nematode species and genera (Nematoda: Chromadorea) from cold seeps on Hikurangi Margin, New Zealand Author Leduc, Daniel National Institute of Water and Atmospheric Research, Wellington, 14 - 901, New Zealand. daniel.leduc@niwa.co.nz text European Journal of Taxonomy 2023 2023-01-10 856 1 45 http://dx.doi.org/10.5852/ejt.2023.856.2025 journal article 223185 10.5852/ejt.2023.856.2025 f565e591-f14b-437d-9a18-071194a6a53e 2118-9773 7522913 1EF03A88-7A30-4CAB-822C-9911BCF38601 Genus Siphonolaimus de Man, 1893 Anthraconema zur Strassen, 1904: 302 . Chromagaster Cobb, 1894: 419 . Type species Siphonolaimus niger de Man, 1893 . Diagnosis (from Zograf et al . 2015 ) Cuticle striated. Buccal cavity containing an axial cuticularized spear-like structure (siphon). Six outer labial setae and four cephalic setae situated more or less at same level, the six always shorter than the four.Amphids circular. One anterior outstretched ovary. Single anterior testis. Gonad located to the left of intestine. Remarks A key to males of all 21 valid species of Siphonolaimus was provided by Zograf et al. (2015) .