Four new and four known species of Tylencholaimoidea (Dorylaimida: Nematoda) from China

Four new and four known species of soil nematodes belonging to the superfamily Tylencholaimoidea Filipjev, 1934 are reported from China. Tylencholaimus orientalis sp. nov. is characterized by having a 0.45–0.61‐mm body; a 5–6‐µm odontostyle; a monoprodelphic genital system with a short post‐uterine sac; and a conoid to hemispheroid tail. Tylencholaimus sinensis sp. nov. is characterized by having a 0.76–0.82‐mm body; a 7–7.5‐µm odontostyle; an amphidelphic genital system; a conoid to hemispheroid tail; and males with 32‐µm spicules and three ventromedians. Proleptonchus sinensis sp. nov. is characterized by having a 1.4–1.7‐mm body; wide amphids; 8–9‐µm odontostyle; a monoprodelphic genital system, the posterior branch with well‐developed uterus and oviduct rudiments; slender and slightly arcuate spicules; and a short conoid tail with thick cuticle at terminus. Dorylaimoides alpinus sp. nov. is characterized by having a 1.4–1.5‐mm body; a lip region offset by a depression; a 12–13‐µm odontostyle; an arcuate odontophore; an amphidelphic genital system with transverse vulva; and a tail that gradually tapers to a blunt terminus.