Abstract
Two nematode species found in Lake Baikal, Gorevoi Utes (Russia) are presented. Eutobrilus mirandus sp. n. differs from all other species of the genus Eutobrilus by the markedly anterior position of the vulva (V=26-31%). The new species is similar toE. andrassyi Altherr, 1963 in body size and stoma structure but differs in the comparatively thicker body (males, a = 3>2-A5 versus a = 60-75), shorter stoma (males, 26-27 um long versus 35-40 \im long), longer spicules (48-53 urn versus 40 urn), and absence of crystalloids. A redescription and new illustrations of Paratrilobus delicatus (Shoshin, 1988) Andrassy, 2007, including a description of the previously unknown females, are also given.
NSTL