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— Five species belonging to the family Aristeidae are reported from the Pacific coast of northern Japan. One, Aristeus pallidicauda, is described as new based on a male and female specimens from off Miyako, Iwate Prefecture, at depths of 500-700 m. Plesiopenaeus edwardsianus (Johnson, 1867) is reported from northern Japan for the first time. Three species previously recorded from this area also included, Aristaeomorpha foliacea (Risso, 1827), Aristeus virilis (Bate, 1881), and Aristeus mabahissae Ramadan, 1938. The present material represents the northern limit of the distribution of these species in the western Pacific. During a survey of the deep-sea crustacean fauna along the poorly explored Pacific coast of northeastern Honshu mainland, Japan, a small collection of aristeid shrimps was obtained. It includes five species, Aristaeomorpha foliacea (Risso, 1827), Aristeus mabahissae Ramadan, 1938, A. pallidicauda, new species, A. virilis (Bate, 1881), and Plesiopenaeus edwardsianus (Johnson, 1867). Among the eight recognized species of Aristeus, the new species appears to be allied to Aristeus antennatus (Risso, 1816) and A. antillensis A. Milne Edwards & Bouvier, 1909, but can be distinguished from them by the relative lengths of some pereopodal articles, the number of pereopodal photophores, and morphology of the male third maxilliped and female episternite on the eighth thoracic somite. The specimens examined are deposited in the Laboratory of Marine Zoology, Faculty of Fisheries, H o k k a i d o Univers i ty (HUMZ). Most of the terminology used in the description is that proposed and illustrated by Perez Farfante (1977). The structure on the eighth thoracic sternite situated posterior to the coxae of the fifth pereopods is termed as "episternite" fol lowing Crosnier & Forest (1973). The following abbreviations are used in the text: CL = postorbital carapace length; M N H N = Museum national d'Histoire naturelle; NSMT = National Science Museum, Tokyo. Color is described on the basis of fresh or live specimens.

crustacean research/researches on crustacea, special number/kokakurui no kenkyu/kōkakurui no kenkyū

Deep-sea shrimps of the family Aristeidae (Decapoda: Dendrobranchiata) from northern Japan, with the description of a new species of the genus Aristeus