Abstract
Three new and two known species of the genus Mesodorylaimus Andrassy, 1959 are described and illustrated. M. caudatus n. sp. has a slender body, an attenuated odontostyle, transverse vulva and an elongate almost straight tail and is related to M. nigritulus (Schneider, 1937) Andrassy, 1959; M. adalberti Andrassy, 1963 and M. parasubtilis (Meyl, 1957) Andrassy, 1959. M. loofi n. sp. is distinctive in having a 'double' guiding ring, transverse vulva, posterior portion of intestine with a long tongue-like structure and a long filiform tail, while M. vulvastriatus n. sp. has a longitudinal vulva with cuticular infoldings on both sides. M. bastiani (Butschli, 1873) Andrassy, 1959 and M. clavicaudatus (Thorne & Swanger, 1936) Andrassy, 1959 are redescribed. SEM observations have been made on M. vulaastriatus.
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