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Mysis diluviana.jpg
Mysis diluviana
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Order: Mysida
Family: Mysidae
Genus: Mysis
Latreille, 1802

Mysis is a genus of mysid crustaceans in the family Mysidae, distributed mainly in the coastal zone of the Arctic and high boreal seas. Several species also inhabit northern freshwater lakes and the brackish Caspian Sea. Fifteen species are recognized.[1][2][3] Body lengths range from 1 to 3 centimetres (0.4 to 1.2 in).

The freshwater taxa of the genus have been referred to as "glacial relicts", and they comprise four closely related species, most of which also live in brackish water. Mysis relicta is a freshwater species from boreal lakes of Northern Europe, also present in the Baltic Sea. Mysis salemaai is another North European and Baltic Sea taxon. Mysis segerstralei is a fresh- and brackish-water species of the Eurasian and North American Arctic and sub-Arctic. The North American lakes, including the Great Lakes, are inhabited by Mysis diluviana.[2]

Four endemic species inhabit the Caspian Sea.[4] They have specialized and adapted to the cold, deepwater habitats of the landlocked basin. For example, the bathyal M. amblyops, the smallest mysid in the genus, has reduced eyes.[5][6] Four species also have circum-arctic distributions (M. oculata, M. nordenskioldi, M. segerstralei, M. polaris).[4]

Generic characters: frontal margin of carapace convex, angular; antennal scale with setae around all margins, segment 2 of maxilla 2 palp large, axe-shaped, with strong serrated spine-setae; pereiopods long, carpopropodus 7–9-segmented; male pleopod 4 5-segmented, segment 4 as long as segment 3; telson with cleft.



  1. ^ Jan Mees (2012). "Mysis Latreille, 1802". World Register of Marine Species. Retrieved December 8, 2012. 
  2. ^ a b A. Audzijonytė & R. Väinölä (2005). "Diversity and distributions of circumpolar fresh- and brackish-water Mysis (Crustacea: Mysida): descriptions of M. relicta Lovén, 1862, M. salemaai n. sp., M. segerstralei n. sp. and M. diluviana n. sp., based on molecular and morphological characters". Hydrobiologia 544 (1): 89–141. doi:10.1007/s10750-004-8337-7. 
  3. ^ A. Audzijonytė & R. Väinölä (2007). "Mysis nordenskioldi n. sp. (Crustacea, Mysida), a circumpolar coastal mysid separated from the NE Pacific M. litoralis (Banner, 1948)". Polar Biology 30 (9): 1137–1157. doi:10.1007/s00300-007-0271-5. 
  4. ^ a b A. Audzijonytė, J. Damgaard, S.-L. Varvio, J. K. Vainio & R. Väinölä (2005). "Phylogeny of Mysis (Crustacea, Mysida): history of continental invasions inferred from molecular and morphological data". Cladistics 21 (6): 575–596. doi:10.1111/j.1096-0031.2005.00081.x. 
  5. ^ Georg Ossian Sars (1895). "Crustacea Caspia. Account on the Mysidae in the collection of Dr. Grimm". Bulletin Academii Imperii Scientorum St. Petersbourg 5. 
  6. ^ Georg Ossian Sars (1907). "Mysidae". Trudy Kaspiiskoi Ekspeditsii 1904. Goda 1: 243–313.