Two new Poikilolaimus (Rhabditidae) species from Japan: P. yaeyamaensis n. sp. from Neotermes sugioi (Kalotermitidae) and P. alni n. sp. from Xenomimetes alni (Curculionidae)
Summary: Two new Poikilolaimus species are described and illustrated. Poikilolaimus yaeyamaensis n. sp. was isolated from a dampwood termite, Neotermes sugioi and is typologically and phylogenetically close to a Taiwanese species, P. carsiops , isolated from N. koshunensis . The new species shares a highly characteristic, cross-shaped stomatal opening with P. carsiops , but can be distinguished from the latter by the arrangement of its paired genital papillae (four vs five pairs), distinct morphometric values and unique molecular profiles. Poikilolaimus alni n. sp. was isolated from a wood-boring weevil, Xenomimetes alni , collected in Sugadaira, Nagano, Japan. It is typologically and phylogenetically close to P. micoletzkyi , as these two species share a characteristically thin male spicule and a conical female tail. However, the new species can be distinguished from P. micoletzkyi by its arrangement of male genital papillae, possessing eight pairs versus six pairs in the Austrian population or nine pairs in the German population, as well as by its molecular profiles.