PSEUDOLELLA TENUIS SP N. AND PARACOMESOMA LEPTUM SP N. (NEMATODA, ARAEOLAIMIDA) FROM VIETNAM

Illustrated descriptions of the two new nematode species found in artificial reservoirs for strimp cultivation are given: Pseudolella tenuis sp. n. and Paracomesoma leptum sp. n. The former is morphologically close to P bengalensis (Timm 1957) and Tchesunov 1978, but differs from P bengalensis by the shorter body, the comparatively longer pharynx, the comparatively shorter and less slender tail, the longer stoma, the shorter ventral branch of the amphidial fovea, and the shorter spicules and cephalic setae. It differs from P capera by the shorter cephalic setae, the wider labial region, the longer ventral branch of the amphidial fovea, and the longer spicules. Paracomesoma leptum 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 the shorter and thicker body, the shorter cephalic and subcephalic setae, and the less numerous precloacal supplements in the male. This new species differs from P minor by the less slender tail, the shorter cephalic and outer labial setae, the presence of subcephalic setae, and the longer spicules.