Gammarus lacustris, G. O. Sars, 1863

Brittany as G. d. celticus; this taxon is not considered here). In E. The Gammarus lacustris View in CoL group. contradistinction to the species in the zaddachi and tigrinus This group contains the pure freshwater species. groups, these species are not patterned, but unicoloured. Morphologically the group is characterized by short oval eyes, and a short inner ramus of uropod 3. The two Nordic species are probably not especially closely related. G. lacustris has a 12. Gammarus duebenii Liljeborg, 1852 holarctic distribution, while G. pulex is exclusively palaearctic. NB. The genus name Rivulogammarus S. Karaman, 1931 , Synonyms: Rivulogammarus duebenii auct. (NB. The often used for this group, is unavailable ( Stock, 1969a). specific epithet is often written duebeni , and the author’s name

Lilljeborg; both are incorrect.).