Caprella acanthogaster Mayer
Length: 7 - 42+ mm. Numerous pairs strong dorsal spines from posterior edge of pereonite 2 through pereonite 7, and row of projections around base of gill insertions. (E.g., pereonite 2 with 4 pairs dorsal spines at posterior end; pereonite 3 with 7 pairs dorsal spines, antero- and poster- lateral pair of spines, 3 spines above insertion of each gill, further lateral projections; pereonite 4 with 8 pairs dorsal spines, antero- and postero lateral pair of spines, 3 spines above insertion of each gill, further lateral projections; pereonite 5 with 7 pairs dorsal projections and several lateral spines; pereonites 6 + 7 each with 1-2 pairs of dorsal spines.) Head with small pair of dorsal tubercles; Cephalon, pereonite 2 and gnathopod 2 with sensory hairs. Antenna 1 very long, a little shorter than body length; antenna 2 a little shorter than ½ antenna 1 peduncle. Gnathopod 2 attached to posterior end pereonite 2; propodus with median grasping spine, distal strong ‘tooth’ separated from most distal triangular projection by a groove. Gills elongate. Pereopods 5 - 7 propodus with median grasping spines.
Has been confused with Caprella mutica in introduced ranges of the latter.
China; Sakhalin; Japan; South America
To 20m depth; attached to aquaculture nets (Scallop and Undaria)