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We describe a new paranthurid isopod genus and species,    Deltanthura   palpus    gen. et sp. nov. , collected from a depth of 805–852 m off the southern coast of Mie prefecture, Japan.    Deltanthura    is similar to    Pseudanthura    Richardson, 1911 in having a triangular pleotelson, acute mandible with a 3-articulate palp, a maxillipedal endite, and a tapering uropodal exopod, but differs in having eyes and neotenous characters (reduced pereonite 7 and pereopods 7 lacking).    Deltanthura    and four paranthurid genera (   Califanthura    Schultz, 1977,    Colanthura    Richardson, 1902,    Cruranthura    Thomson, 1946, and    Cruregens    Chilton, 1882) share neotenous characters, but in    Deltanthura    the mandible is acute, with a 3-articulate palp and maxillipedal endites are present.    Califanthura   minuta    Kensley &amp; Heard, 1991 may belong in    Deltanthura    as they share the triangular pleotelson and tapering uropodal exopod, but we refrain from transferring it to    Deltanthura    as its description lacks the other diagnostic characters of    Deltanthura   . We provide a revised key to all genera in   Paranthuridae   Menzies &amp; Glynn, 1968.

zoosystematics and evolution

A new neotenous genus and species,    Deltanthura   palpus    gen. et sp. nov. (  Isopoda  ,   Anthuroidea  ,   Paranthuridae  ) from Japan, with a revised key to the genera in   Paranthuridae