title: A new species of Pseudomacrochiron Reddiah, 1969 (Crustacea: Copepoda: Macrochironidae) associated with scyphistomae of the moon jellyfish Aurelia sp. (Cnidaria: Scyphozoa) off Japan.
abstract: A new species of the Macrochironidae Humes & Boxshall, 1996 (Copepoda: Cyclopoida), Pseudomacrochiron                         aureliae n. sp., is described based on adult specimens extracted from the gastrovacular cavity of the scyphistomae of Aurelia sp. (Cnidaria: Scyphozoa) collected in the Seto Inland Sea and Ise Bay off the coast of Japan. The new species differs from its congeners by having the following combination of characters: a caudal ramus with a length to width ratio of 3.1; an accessory flagellum on caudal setae II, III and VI; three apical setae on the maxillule; only setae I and II on the maxillary basis; two short spines on the female maxilliped claw (endopod); an armature of III, I, 4 on the terminal exopodal segment of leg 3; an armature of I, II, 2 on the terminal endopodal segment of leg 3; an armature of II, I, 4 on the terminal exopodal segment of leg 4; and a short free exopodal segment of leg 5 (length to width ratio of 1.4) armed with a long seta and short spine. P. aureliae n. sp. is the first member of the genus reported from off Japan and from the scyphistomae of its scyphozoan host.
authors.affiliation: Laboratory of Aquaculture, Department of Bioresource Science, Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan. copepods@gmail.com
authors.forename: Danny
authors.initials: D
authors.lastname: Tang
authors.forename: Akira
authors.initials: A
authors.lastname: Yasuda
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yamada
authors.forename: Kazuya
authors.initials: K
authors.lastname: Nagasawa
mesh_terms: D000818:Animals; D033342:Copepoda / Q000033:anatomy & histology / Q000145:classification / Q000502:physiology; D005260:Female; D007564:Japan; D008297:Male; D037401:Scyphozoa / Q000469:parasitology*; D013045:Species Specificity