Free-living nematodes from nature reserves in Costa Rica Genera Egtitus Thorne, 1967 and Trachypleurosum Andrássy, 1959 (Dorylaimida: Actinolaimidae)

摘要

Some actinolaimid nematode species belonging to the genera Egtitus Thorne, 1967 and Trachypleurosum Andrássy, 1959 are described or redescribed from Costa Rica. Egtitus costaricae sp. nov. is distinguished from the related spe- cies, E. biformis Andrássy, 2012, E. neocyatholaimus (Kreis, 1936) and E. proximus (Yeates, 1973), by the wide lip region (21– 23 vs 15–17 μm) and the low number of the male supplements (6–8 vs 9–13). The Costa Rican specimens of Trachypleurosum venezolanum Coomans, Vinciguerra & Loof, 1990 correspond well with the original description. Three probable new species, viz. Egtitus sp. 1, Egtitus sp. 2 and Trachypleurosum sp. are also described on the basis of male specimens, but due to lack of females they are not provided with species names. In the Appendix five genera and forty-two species of free-living nematodes described as new to science from Costa Rica are listed.