Marinogammarus, Sexton & Spooner, 1940

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

G. The Marinogammarus group

All Marinogammarus species are marine and occur mostly intertidally, usually more under stones or in gravel than among algae.Even though one may find several species closely together, the species nevertheless differ in their specific demands. This may lead to a microsegregation, even when present below the same boulder. An example is shown by a study in the Netherlands ( Vader 1965) from a sandy beach with scattered large stones and some freshwater flow. Here Gammarus salinus kept to the free water puddles, Marinogammarus obtusatus lived in clumps of Mytilus above the water, and Relictogammarus stoerensis in the gravel and sand; three species below the same boulder, but still in different habitats!

There are no Marinogammarus species on Svalbard. Their role in the intertidal is there taken over by Gammarus setosus and to a certain degree G. oceanicus . In mesohaline and oligohaline areas, and high in the intertidal, G. duebenii takes over the ‘under stones’ habitat.