Description of two new species from South Korea.

Based on molecular markers, mating experiments, morphological observations and ecological data, two species (Nematoda: Diplogastridae) new to science are described. Both were collected from different Scarabaeoid beetles in South Korea, have a gonochoristic mode of reproduction and fall into a sub-clade of the clade. n. sp. does not show a eurystomatous morph under laboratory conditions and might therefore be suitable for the study of gain and loss of polymorphism. n. sp. is phylogenetically close to Chinese and Japanese species and helps to separate an Asian clade from an American clade.