Abstract
Three known and two new species of Leptolaimoides are described from bottom sediments collected in Skagerrak off the west coast of Sweden. The following known species are redescribed: Leptolaimoides haploopis Jensen, 1978, L. tubulosus Vitiello, 1971 and L. hexatubulosus Hoang Lai-Phu et al., 2009. Leptolaimoides filicaudatus sp. n. is characterised by the 431–543 µm long body; cephalic sensilla papilliform; amphid 23–26 µm long, located 9–10 µm from anterior end; first body pore located 35–37 µm from anterior end; lateral field simple along most of body, areolated on tail, arising 36–40 µm from anterior end; female without supplements, vagina without pars refringens, vulva midventral; male without tubular and without alveolar supplements; spicules arcuate and 16 µm long. Leptolaimoides leptomicron sp. n. is characterised by the 776–847 µm long body; cephalic sensilla papilliform; amphid 15–17 µm long, located 9–13 µm from anterior end; first body pore located 40–46 µm from anterior end; lateral field areolated, arising 26–28 µm from anterior end; female without supplements, vagina without pars refringens, vulva midventral; male with three tubular and without alveolar supplements, spicules arcuate and 28–29 µm long. The diagnosis of the genus Leptolaimoides is emended and a tabular compendium and dichotomous identification key to species of the genus Leptolaimoides are provided.