抄録
Two species of parasitic nematodes, both associated with the Japanese clawed salamander Onychodactylus japonicus (Houttuyn, 1782) (Caudata: Hynobiidae), are treated in this paper. The first, Angiostoma onychodactyla Bursey and Goldberg, 2000 (Rhabditoidea: Angiostomatidae), is redefined as having an elliptical oral aperture without lips; double lateral alae; and male caudal papillae comprising nine pairs of pedunculate papillae, a single sessile papilla anterior to the anus, and two minute projections on the posterior anal lip. A new genus, Shunyanema, is established for Parapharyngodon japonicus Bursey and Goldberg, 1999 (Oxyuroidea: Pharyngodonidae). The new genus is characterized by the didelphic amphidelphic genital system, the vulva situated in the middle region of the body, and the anteriorly directed vagina in females; the absence of a V-shaped sclerotized structure supporting the genital cone in males; and the lack of an operculum and filaments in the eggs. Shunyanema japonicum comb. nov. is also redescribed and illustrated in detail.
