Pseudolella tenuis sp. n. and Paracomesoma leptum sp. n. (Nematoda, Araeolaimida) from Vietnam

Abstract

Illustrated descriptions of two new nematode species found in artificial reservoirs for shrimp cultivation are given: Pseudolella tenuis sp. n. and Paracomesomaleptum sp. n. The former is morphologically close to P. bengalensis (Timm 1957) and P. capera Tchesunov 1978, but differs from P. bengalensis by a shorter body, comparatively longer pharynx, shorter and less slender tail, longer stoma, shorter ventral branch of the amphideal fovea, and shorter spicules and cephalic setae. It differs from P. capera by shorter cephalic setae, wider labial region, longer ventral branch of the amphideal fovea, and longer spicules. Paracomesomaleptum sp. n. is morphologically close to P. susannae Semprucci 2015 and P. minor Gagarin et Nguyen Dinh Tu 2014. From the former species it differs by its shorter and thicker body, shorter cephalic and subcephalic setae, and less numerous precloacal supplements in the male. This new species differs from P. minor by a less slender tail, shorter cephalic and outer labial setae, the presence of subcephalic setae, and longer spicules.