Enterobius (Enterobius) macaci Yen, 1973 (Nematoda: Oxyuridae: Enterobiinae) was collected from a Japanese macaque, Macaca fuscata, in Nara and Yamaguchi Prefectures, Honshu Island, Japan, for the first time. A redescription is presented along with DNA sequence data. This pinworm is a typical member of the subgenus Enterobius and is characteristic in the spicule morphology, being readily distinguished from other congeners. Phylogenetic analyses based on 18S ribosomal RNA gene (rDNA) and mitochondrial DNA (mtDNA) Cox1 gene assign its position in the pinworm lineage adapted to the Old World primates, showing divergence before the splitting of the chimpanzee and human pinworms.

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