Distribution of an alien species, Crangonyx floridanus Bousfield (Crustacea: Amphipoda: Crangonyctidae) in Japan
2007
Kanada, S.(Nippon Engineering Coll., Tokyo (Japan)) | Kuranishi, R. | Ishiwata, S. | Tojo, K. | Shimizu, T. | Taira, H. | Satake, K.
The crangonyctid amphipod, Crangonyx floridanus, originating from North America, has invaded the freshwaters of Japan. Based on specimens and the literature, C. floridanus was recorded in 28 Japanese prefectures. Since the previous study by Morino et al. (2004), the number of records for this amphipod has significantly increased in the Tokyo metropolitan area and Kanagawa prefecture of the Kanto District. In addition, the amphipod was discovered from previously unrecorded geographic areas such as Nagano and Niigata prefectures, as well as the Tohoku, Kansai and Shikoku Districts. Morphological differences between the non-native C. floridanus and three native amphipod families are shown.
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