Stenalpheops anacanthus, new genus, new species (Crustacea, Decapoda, Alpheidae) from the Seto Inland Sea and the Sea of Ariake, South Japan

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  • Stenalpheops anacanthus new genus new s

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Stenalpheops anacanthus, new genus, new species, is described and illustrated from specimens collected from the Seto Inland Sea and the Sea of Ariake, South Japan. Its affinities with the most closely related genus, Potamalpheops Powell, 1979, are discussed. The distinctions from Potamalpheops are: crenate lamella present along the full length of diaeresis of uropodal exopod; orbital teeth lacking; eyestalk with anteromedial protuberance; without ventral tooth on 1st antennular segment; sclerite at the base of antennule unarmed; anal tubercles present; two pairs of dorsal spines of telson situated laterally on proximal half; with 6 epipods and 4 setobranchs; and with rows of grooming setae on medial face of merus of 1st pereopod, which have not been reported in any other taxon. In addition, the symmetrical development of segmented appendix, without musculature, at the distal margin of uropodal exopods is found in two larger male specimens, the holotype (CL 6.6mm) and one paratype (CL 6.4mm). This is certainly unusual and unique, but can present an evidence to show "the distal segment of exopod" of uropods also "sometimes being multiarticulate" (McLaughlin, 1982: 202). CL: carapace length including rostrum.

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