Three new species of free-living nematodes (nematoda) of the family Axonolaimidae from the Mekong River Delta (Vietnam)

Illustrated descriptions of three new free-living nematode species of the family Axonolaimidae (Parodontophora minor, P. nothus, and Pseudotella parva) from the Mekong River delta (Vietnam) are given. Parodontophora minor sp. n. is close to P. danka Belogurov, Kartavtseva 1975, but differs from it in the shorter body, shorter stoma and spicules and the absence of lateral fields. Parodontophora nothus sp. n. differs from P. policta (Gerlach 1955) in the shorter body, spicules, and branches of amphidial fovea. Pseudotella parva sp. n. is similar to P. capera Tchesunov 1978 and P. irritans Smoljanko, Belogurov 1993. It differs from the first species in the shorter body, spicules, branches of amphidial fovea, and the longer tail and from the second one, in the shorter body, shorter spicules and branches of amphidial fovea, and the absence of precloacal supplements in males.