Riouxgolvania kapapkamui sp. n. (Nematoda: Muspiceoidea: Muspiceidae), a peculiar intradermal parasite, is described based on gravid adults, eggs, and first-, second-, and third-stage larvae collected from dermal nodules formed in Myotis macrodactylus and Myotis ikonnikovi bats from Hokkaido, Japan. The nematode is readily distinguished from 3 previously described congeners in having a globular body with brown, transverse striae in the anterior region of fully grown females. The third-stage larva is also distinguished from other congeners by having a round tail end. Nucleotide sequences of the analyzed partial SSU rDNA-ITS1 region and partial cytochrome c oxidase subunit 1 of mtDNA showed greater similarity to chromadoreans rather than to enopleans. This is the first report of muspiceoid nematodes from Asia.

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