Abstract
Descriptions and illustrations are presented for a new genus and two new species of free-living nematodes found in sediments of four artificial reservoirs for shrimp aquaculture. Paradaptonema gen. n. is morphologically close to Daptonema Cobb, 1920, but it has three glands around cardia that are absent in Daptonema, as well as a peculiar structure of the reproductive apparatus in males. Paradaptonema securum gen. n., sp. n. is characterized by a finely annulated cuticle, relatively long external labial setae, the presence of a postvulvar cell, and a peculiar shape of spicules and gubernacula. Thalassomonhystera longisoma sp. n. is morphologically close to Th. minor Gagarin, Nguyen Thi Thu, 2008 and Th. elegans Gagarin, Nguyen Vu Thanh, 2013, but differs from them in the length and slenderness of the body, as well as in the size of the external labial bristles and spicules.
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