Sandy beach on eastern shore of Sylt. Litoralstation (old littoral station), Biological Institute Helgoland, Biologische Anstalt Helgoland (BAH), List, Sylt    (Ref.: Ehlers U 1974)

Havneby, Sonderjyllands Amt, Denmark    (Ref.: Ehlers U 1974)

Laxvik, Swedish west coast, Halland, Sweden    (Ref.: Luther A 1962)

Toro Island (Torö), Stockholms Lan, Sweden    (Ref.: Luther A 1962)

Dalarö, south of Stockholm, Stockholms Lan, Sweden    (Ref.: Luther A 1962)

Fagelbrolandet (Malmö, Fagelbro, Malmo Landet) , Sweden    (Ref.: Luther A 1962)

Storfjarden (Storfjärden, Jarsofjarden, Storfjard) Bay, Finland    (Ref.: Luther A 1962)

Vikarskär (Vikarskar, Vikarskären, Storlandet), Finland    (Ref.: Luther A 1962)

Långörn (Langorn), Finland    (Ref.: Luther A 1962)

Helsinki (Helsingkiranta, Helsinginkyla, Helsinge, Helsingfors, Khel?sinki, Yelsinki), Finland    (Ref.: Luther A 1962)

Henriksberg, Finland    (Ref.: Luther A 1962)

Orn (Örn, Oren, Ern), Finland    (Ref.: Luther A 1962)

Tvärminneön (Tvärminne-ön, Tverminne Ön, Tvärminneö), Finland    (Ref.: Luther A 1962)

Spikarna, Finland    (Ref.: Luther A 1962)

Lappohja (Lappvik), Finnish Bay (Finnischen Meersbusen), Finland    (Ref.: Luther A 1948)

Kallvik (Kallahdenniemi, Kallvikudden, Kallvikudde, Kallvikudd), Finland    (Ref.: Luther A 1962)

Zoologischen Station Tvärminne (Tvarminne), Hanko (Hango, Hangö), Finnish Bay, Finland    (Ref.: Luther A 1948)

Jarno (Jarnon, Järnön, Jernon, Ierno), Finland    (Ref.: Purasjoki KJ 1945)

Netherlands (Holland, Niederlande)    (Ref.: Hartog C den 1977)

Kiel Bay (Kieler Bucht, Kieler Bay, Kielerbugt, Nisler Bach), Germany    (Ref.: Gerlach SA 1954)

Baltic Sea (Ostersjon, Ost-See, Ostsee, Laanemeri, Itameri, Baltyckie Morze, Baltiyskoye More, Baltijos Jura, Baltijas Jura, Balti Meri, Ostersoen, Balticum)    (Ref.: Ax P 1960)

Schlei, Kieler Bay, Schleswig-Holstein, Germany    (Ref.: Ax P 1951)

Bottsand, Kiel Bay (Kieler Bucht; Kielerbugt; Nisler Bach), Germany    (Ref.: Ax P 1951)

Lake Glensevern and Upper Duck Pond, Campobello Island, New Brunswick, Canada    (Ref.: Ax P, Armonies W 1987)

Herring Cove, Campobello Island, New Brunswick, Canada    (Ref.: Ax P, Armonies W 1987)

New River Beach, New Brunswick, Canada    (Ref.: Ax P, Armonies W 1987)

Rantum-Süd, Sylt Island, Germany, North Sea    (Ref.: Armonies W 1987)

Raantem Inge, Rantum, Sylt Island, Germany, North Sea    (Ref.: Armonies W 1987)

Nielönn, north of Kampen, Sylt Island, Germany, North Sea    (Ref.: Armonies W 1987)

Elbe Estuary (Elbeästuar Elbmündung Elbemündung), Germany    (Ref.: Ax P 1957)

Inner Königshafen, Sylt Island, Germany, North Sea    (Ref.: Hellwig M 1987)

Weser #1, Dedesdorf, Weser River, 25 km south of Bremerhaven, Germany    (Ref.: Düren R, Ax P 1993)

Weser # 2, Baden, Weser River, 20 km southeast of Bremen, Germany    (Ref.: Düren R, Ax P 1993)

Elbe River, near Hamburg-Harburg, Germany    (Ref.: Düren R, Ax P 1993)

Weser River Estuary, Lower Saxony, Germany    (Ref.: Krumwiede A, Witt J 1995)

Tegeler Plate Süd, Weser River Estuary, Lower Saxony, Germany    (Ref.: Krumwiede A, Witt J 1995)

Tegeler Plate Nord, Weser River Estuary, Lower Saxony, Germany    (Ref.: Krumwiede A, Witt J 1995)

Sahlenburg Watt, Weser River Estuary, Lower Saxony, Germany    (Ref.: Krumwiede A, Witt J 1995)

Near weir at Geesthacht, Germany    (Ref.: Müller D, Faubel A 1993)

Belgium coast    (Ref.: Schockaert ER, Jouk PEH, Martens PM 1989)

Greifswalder Bodden (Bay of Greifswald), Germany    (Ref.: Ax P 2008)