Revision of the East Asian species of Crangon (Decapoda: Caridea: Crangonidae)

Based on several type specimens and material collected from various localities, the East Asian species of Crangon are revised. C. affinis De Haan, 1849, C. propinquus Stimpson, 1860, C. dalli Rathbun, 1902a, C. hakodatei, Rathbun, 1902b, C. cassiope De Man, 1906, C. amurensis Brashnikov, 1907 and C. uritai new species are recognized. C. affinis is given full specific status. A neotype is designated for C. propinquus. C. septemspinosa forma amurensis and C. septemspinosa forma anivensis are assigned to C. amurensis. The taxonomic status of C. dalli, C. hakodatei and C. cassiope is clarified by the examination of the type specimens and/or topotypic specimens. Each species is diagnosed and illustrated. C. uritai, which had been confused with C. affinis, is fully described and illustrated. Affinities and distribution of these seven species are discussed and a key is provided