A new species of free-living marine nematode, Fotolaimus cavus sp. nov. (Nematoda, Oncholaimida, Oncholaimidae), isolated from a submarine anchialine cave in the Ryukyu Islands, southwestern Japan

Line drawings of Fotolaimus cavus sp. nov. A, C, D. Holotype (ICHUM 8474); B, E, F. Paratype (ICHUM 8477); G. Paratype (ICHUM 8479). A. Male posterior region, right lateral view; B. Female posterior region, right lateral view; C. Spicule and gubernaculum, right lateral view; D. Male reproductive system, right lateral view; E. Female reproductive system, right lateral view; F. Demanian system, right lateral view; G. Demanian system, dorsal view. Scale bars: 50 μm (A, B); 10 μm (C); 100 μm (D–G).