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Species Caprella mutica

Caprella mutica - male
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Crustacea (Crustaceans)
Class Malacostraca (Malacostracans)
Superorder Peracarida (Peracarida (Amphipods and Isopods))
Order Amphipoda (Amphipods)
Suborder Senticaudata
Family Caprellidae
Genus Caprella
Species mutica (Caprella mutica)
Synonyms and other taxonomic changes
Caprella mutica Schurin, 1935
Caprella macho Platvoet et al, 1995
Caprella acanthogaster humboldtiensis Martin, 1977
Males can reach 50mm (1)
On the Northeast US coast, the native Caprellid species are all under 16mm in length. Habitat is also a useful indicator: C. mutica is often exclusively synanthropic, found living in and around areas of human activity. For more details, see the cited reference. (1)
Native to the subarctic Sea of Japan around parts of Hokkaido, Sakhalin, the Kuril Is. and the coast of Russia at least to the border with North Korea. Introduced populations first discovered on the West Coast of NA in 1973, Northern Europe in 1995, New Zealand in 2002, and the East Coast of NA in 2003. (1)
Internet References
Wikipedia - detailed description and images (1)
Works Cited