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. Paratype (ICHUM 8477); F. Paratype (ICHUM 8479). A. Male body, right lateral view; B. Female body, right lateral view; C. Male cervical region, right lateral view; D. Male cephalic region, right lateral view; E. Female cephalic region, right lateral view; F. Female cephalic region, dorsal view. Scale bars: 1 mm (A, B); 100 μm (C); 20 μm (D–F).