L. nassa Stein, 1852

Habitat. Freshwater.

Distribution. BR: Neartic, Palaeartic (Mayén-Estrada & Aguilar-Aguilar 2012).

Canada: Alberta, 2 mi. E Vilna, Cache L. at ALTA 28 (54°8'27.85"N, 111°46'51.82"W). France: Bretagne, Côtes-du-Nord, 0.75 mi. SE Louargat, creek at D31 (48°33'23.89"N, 3°19'53.41"W); Côtes-du- Nord, 1.1 mi. NW Louargat, creek at D31 (48°34'54.54"N, 3°20'47.71"W).

Germany: Bavaria, near Freiburg-im-Breisgau (47°58'56.13"N, 7°51'23.17"E); Bielefeld; Near Erlangen spring near Vach (49°31'16.43"N, 10°58'3.92"E); Potsdam, Niemegk (52°4'45.00"N, 12°41'46.94"E). Italy: Lombardy, near Ponte Tresa, Lago di Lugano (45°58'7.82"N, 8°51'38.12"E); near Porto Ceresio, Lago di Lugano (45°54'22.16"N, 8°54'21.23"E).

Russia: Lake Baikal, Irkutsk (51°53'52.12"N, 105°4'22.60"E).

Switzerland: Basel, near Basel, Allschwil (47°33'17.42"N, 7°32'43.67"E); near Basel, Schusterinsel (47°35'32.64"N, 7°35'30.86"E). Geneve, near Geneva, small stream at Troinex (46°9'41.88"N, 6°8'48.97"E).

USA: Minnesota, Clearwater Co., Lake Itasca State Park, L Itasca (47°13'3.33"N, 95°12'6.54"W). Washington, Island Co. Whidbey Island, 1 mi. E Keystone, ditch alongside WA 113 (48°9'48.94"N, 122°36'25.46"W).

Hosts. Canada: Gammarus lacustris lacustris Sars (coxae and pereiopods). France: Echinogammarus berilloni (coxae and pereiopods). Germany. Gammarus pulex (coxae, pereiopods, corporal surfaces), G. roeselii (cited as Carinogammarus roeselii) (pereiopods). Italy: Gammarus sp. Russia: gammarid amphipods (appendages and carapace). Switzerland: Gammarus pulex (pereiopods and abdomen). USA: Gammarus lacustris lacustris (pereiopods), Eogammarus confervicolus (Stimpson) (coxae and pereiopods).

References. Clamp 1984; Rustige 1991; Rustige & Mannesmann 1991.