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

preferably on a substrate of sand, gravel, or shells; occurs also G. The Marinogammarus group on intertidal pebble beaches. Tolerates some freshwater flow, All Marinogammarus species are marine and occur mostly but not much fine sediment. Penetrates less far into fjords than intertidally, usually more under stones or in gravel than among? M finmarchicus : in Hardanger to Samlafjorden (Brattegard algae.Even though one may find several species closely together, 1966), in the Sognefjord to Lavik ( Vader 1977a) the species nevertheless differ in their specific demands. This Distribution in Norway: Probably occurs along the entire may lead to a microsegregation, even when present below the Norwegian coast, but absent in Svalbard. 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 16. Marinogammarus pirloti Sexton & Spooner , water puddles, Marinogammarus obtusatus lived in clumps of 1940 Mytilus above the water, and Relictogammarus stoerensis in the gravel and sand; three species below the same boulder, but still Synonyms: Chaetogammarus pirloti auct.; Echinoin different habitats! gammarus pirloti auct. There are no Marinogammarus species on Svalbard. Their Description and illustrations: Sexton & Spooner 1940, p. role in the intertidal is there taken over by Gammarus setosus 667, figs 9-10, pl. 4; Lincoln 1979, pp 265-269, figs 122b, 124 and to a certain degree G. oceanicus . In mesohaline and ( Chaetogammarus p.). oligohaline areas, and high in the intertidal, G. duebenii takes Ecology and habitat: Intertidally, under stones and among over the ‘under stones’ habitat. algae ( Ascophyllum, Enteromorpha ) at places where freshwater

flows out. Distribution very patchy, but may be numerous where