Seven species of asellote isopods including a new species are reported from Sagami Bay, central Japan. Janiralata sagamiensis sp. nov. is distinguished from its congeners by: the reduced rostrum; the distally rounded pleotelson without concavities; frontally well-projected lateral lappets of cephalon, with acute apex; broad short pleotelson; the robust propodus of pereopods; the broad lateral horn of male pleopod 1; slightly upward-curved tip of the lateral horns of male pleopod 1; moderately short stylet of appendix masculina; the second article of endopod of the pleopod 3 with 3 plumose setae distally. Janiralata chuni (Janiridae) is redescribed based on newly collected specimens. Ianiropsis tridens (Janiridae) is recorded from Japanese waters for the first time.
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