title: A new species ofAspidophryxus(Isopoda, Dajidae), ectoparasitic onMysidella hoshinoi(Mysidae) in Japan.
abstract: A new dajid,Aspidophryxus izuensissp. n., is described from seven females and six males found infesting the dorsal carapaces of specimens ofMysidella hoshinoiShimomura, 2016 (Mysidae: Mysidellinae) associated with an unidentified species of sea anemone (Haloclavidae) from Izu-Oshima Island, Sagami Sea, central Japan.Aspidophryxus izuensissp. n. differs from its congeners in having a body length about as long as wide, widest at the anterior part in females; an elongate frontal part of the cephalon, half as long as wide in females; the frontal margin of the cephalon exceeding the anterior margins of lateral lamellae in females; an unsegmented, vermiform, elongate pleon in females; and a uropod composed of a protopod and an inner and outer ramus in males. A key to worldwide species in the genus is provided.
authors.affiliation: Kitakyushu Museum of Natural History and Human History, Kitakyushu 805-0071, Japan.
authors.forename: Michitaka
authors.initials: M
authors.lastname: Shimomura
keywords: Aspidophryxus; Dajidae; Izu-Oshima Island; Mysidella; parasite