Photomicrographs of Mononchus pseudoaquaticus sp. nov. Females from populations collected from riverbanks of the rivers Veleka (A, G, H), Danube (B, D, E, I, J), Shirokoleshka (C, L) and Maritsa (F, K): A–D anterior region (transverse ridge arrowed in D) E–G vulval region showing an egg (E) vulval opening, subventral view (F) and pars refringens vaginae (G) H, I tail J caudal glands (arrowed) K caudal pores (arrowed) L tail tip. Scale bars: 20 µm (A–G, K); 30 µm (J, L); 50 µm (H, I).