Integrative taxonomic study of mononchid nematodes from riparian habitats in Bulgaria. I. Genera Mononchus Bastian, 1865 and Coomansus Jairajpuri & Khan, 1977 with the description of Mononchus pseudoaquaticus sp. nov. and a key to the species of Mononchus

Photomicrographs of Mononchus pseudoaquaticus sp. nov. Holotype (A–C, E, F, H, I, L) and paratype (D, G, J, K) females: A body, total view B–E anterior region (transverse ridge arrowed in C; amphid opening arrowed in Е) F, G vulval region showing pars refringens vaginae and posterior genital branch (F) H–J tail (caudal glands arrowed in J) K, L tail tip showing one small papilla (arrowed in K) and terminal spinneret (L). Scale bars: 400 µm (A); 20 µm (B–E, G, J, K, L); 30 µm (F, I, H).