We describe a new typhlotanaid species, sp. nov., collected from between 167 and 488 m depth in the Sagami Sea, Japan. This is the first record of from the northern hemisphere. resembles from the Subantarctic region in having pereonites 1-3 widest anteriorly (not rectangular), but differs from it in the length ratio of antennal articles 4/5; the number of setae on the dactyli of pereopods 1-3, ischia of pereopods 4-6, and carpi of pereopods 4-6; the shape of the unguis of pereopods 4-6; and the shape of the uropodal endopod. We determined partial sequences for the cytochrome oxidase subunit I (COI; cox1) and 18S rRNA (18S) genes in . A phylogenetic reconstruction based on the 18S sequences recovered a highly supported Typhlotanaidae clade containing and , with sp. (Agathotanaidae) as the sister taxon. A key to species of is presented.
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