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Caprella californica Stimpson, 1857 [sensu lato] is one of the dominant species of Caprella spp. (Crustacea: Amphipoda) along the Pacific coast of Mexico to Canada and Japan to Hong Kong, China, and recently widely reported from the Australian coasts. Detailed morphological comparison of C. californica [sensu lato] collected from California and the Uwa Sea, Japan, revealed several diagnostic differences, including: (1) the body somites of the former are more slender than those of the latter; (2) in the male of the former, head possesses an anteriorly curved dorsal projection, while in the latter, head possesses a straight, forward-pointing dorsal projection; (3) in the former, pereonite 5 is longer than pereonites 3 and 4, while in the latter, pereonite 5 is the same length as pereonite 3; (4) in the male of the former, propodus of gnathopod 2 has a small apical rectangular projection, while in the latter, the corresponding margin has a large round projection; and (5) in the former, pereopod 7 is slender with the merus and propodus subequal, while pereopod 7 in the latter is robust with the merus shorter than propodus. These differences are indications of species level differences. Thus, we propose Caprella scauroides Mayer, 1903 to a species level for the Japanese C. californica [sensu lato]. A detailed description with illustrations of C. californica [sensu stricto] and C. scauroides is provided.

helgoland marine research

Description of two species of Caprella (Crustacea: Amphipoda: Caprellidae) from the North Pacific; C. californica Stimpson, 1857 and C. scauroides Mayer, 1903, with a new appraisal of species ranking for C. scauroides