Abstract
Two new species of Viscosia from the intertidal zone along the Yellow Sea are described and illustrated. Viscosiamedia sp. nov. is characterized by a heavily cuticularized and relatively shallow buccal cavity with stubby teeth; cephalic setae 7-8 µm long; amphidial fovea invisible; slender spicules almost straight, cephalated proximally and conical distally; and tail conical, straight in males and slightly bent ventrally in females. Viscosiasinica sp. nov. is characterized by a relatively large amphidial fovea, conico-cylindrical tail with swollen horseshoe-shaped tip, spicules slightly curved ventrally, and 10-12 setae surrounding the cloaca, each 3-4 µm long. The basic morphological data of males of 26 valid species in Viscosia with a body length of 1-2.9 mm are presented.