Swedish Plectida (Nematoda). Part 4. The genus Leptolaimus de Man, 1876

摘要

Twelve known and nine new species of Leptolaimus are described from bottom sediments collected in marine habitats of Sweden, including the Bothnian Sea and Bothnian Bay, the Baltic Sea proper, Gullmarn Fjord and the Skagerrak. Three of these species have been previously recorded in Sweden while nine are new records for the Swedish fauna. The following known species are redescribed: Leptolaimus papilliger de Man, 1876, L. cupulatus Lorenzen, 1972, L. danicus Jensen, 1978, L. donsi (Allgén, 1946) comb, n., L. mixtus Lorenzen, 1972, L. pel/ucidus (Southern, 1914) comb, n., L. venustus Lorenzen, 1972, L. lorenzeni (Boucher & de Bovée, 1972) comb, n., L. alatus Vitiello, 1971, L. macer Lorenzen, 1972, L. septempapillatus Platt, 1973, L. elegans (Schuurmans Stekhoven & De Coninck, 1933) Gerlach, 1958. Leptolaimus primus sp. n. is characterised by the 319-472 um long body; rounded labial region continuous with body contour; cephalic setae 1.5-2.0 um long; amphid located 7.0-11.5 urn from anterior end; first body pore located 18.5-28.0 urn from anterior end; lateral field originating 35 urn from anterior end; female without supplements, vagina without pars refhngens, vulva midventral; male without tubular and with four alveolar supplements, alveolar supplements without sclerotized inner ring; spicules arcuate and 13.5-16.0 urn long. Leptolaimus secundus sp. n. is characterised by the 576-645 urn long body; rounded labial region continuous with body contour; cephalic setae 2.0 urn long; amphid located 6.5-7.0 urn from anterior end; first body pore located 23.0-28.5 urn from anterior end; lateral field originating 18.0-23.0 urn from anterior end; female without supplements, vagina without pars refringens, vulva midventral; male with single tubular and 9-15 alveolar supplements, tubular supplement weakly arcuate with blunt tips, alveolar supplements with sclerotized lining; spicules arcuate and 23.0-26.5 urn long.