Marinogammarus marinus ( Leach, 1815 )

Vader, Wim & Tandberg, Anne Helene Solberg, 2019, Gammarid amphipods (Crustacea) in Norway, with a key to the species, Fauna norvegica 39, pp. 12-25 : 21

14. Marinogammarus marinus ( Leach, 1815)

Synonyms: Gammarus marinus auct; Chaetogammarus marinus auct; Echinogammarus marinus auct.

Description and illustrations: Stephensen 1935 -42, p. 340, figs 45-46pp; Sexton & Spooner 1940, p. 638, figs 1-2; Lincoln 1979, pp 265, 267, figs 122a, 123 ( Chaetogammarus m.).

Ecology and habitat: This is the most euryoecious of the Marinogammarus species. Usually it is to be found under stones in the upper half of the intertidal. In places with some freshwater flow, or where M. obtusatus and/or? M. finmarchicus for some reason are absent, it may occur lower down. M. marinus tolerates more sediment in the substrate than the other species, and it also occurs in brackish waters. In estuaries it occurs far into the mesohalinicum (den Hartog 1964). In the fjords in W. Norway it penetrates very far: in Hardanger until Osafjorden (Brattegard 1966), in the Sognefjord far into the Lusterfjord ( Vader 1977a).

Distribution in Norway: Very common everywhere in southern Norway. Its distribution is insufficiently known in northern Norway: it is not rare around Tromsø, but we know of no reliable records east of the North Cape.