|  | site | site # (info) | collection date | kind | depth | substrate | salin | comments | reference | 
| A | Sile (Artane, Chile, Schile, Kilia), Black Sea (Chernoe More, Chernoye More, Euxine Sea, Schwarzes Meer), Turkey | 785 
  map | Sep 26, 1956 |  | 1 m | medium and coarse sand between broken rocks |  |  | Ax P (1959): 100 | 
| B | Baltalmani (Baltaliman), Istanbul Bogazi (Karadeniz Bogazi, Bosporus, Bosphorus), Turkey | 467 
  map | Aug 29, 1956 |  |  | coarse sand | 14.6 ppt |  | Ax P (1959): 100 | 
| C | Küçük Su (Kucuksu), asian river bank, Istanbul Bogazi (Karadeniz Bogazi, Bosporus, Bosphorus),Turkey | 470 
  map | Sep 16, 1956 |  |  | mud sand (Schlicksand) | 17.6 ppt |  | Ax P (1959): 100 | 
| D | Yesilkoy (San Stefano), Sea of Mamara (Mamara Meer), Turkey | 786 
  map | Sep 7, 1956 |  |  | clay sand |  |  | Ax P (1959): 100 | 
| E | Tuzla, Sea of Marmara (Marmara Meer), Turkey | 778 
  map | Aug 24, 1956 |  |  | mud sand between Zostera | 34.2 ppt |  | Ax P (1959): 100 | 
| F | Traeth Bach (Traeth Bychan), Anglesey, North Wales, United Kingdom | 1872 
  map | 1958-1961 |  |  | coarse sand, fine shell gravel |  | occasional at LWN. | Boaden PJS (1963): 83 | 
| G | Razelm-Sinoë, Northern Bay-Sulina, Romania | 2575 
  map | 1974 or earlier |  | 5.0 m |  |  | Numerous specimens. | Mack-Fira V (1974): 263 | 
| H | Razelm-Sinoë, Northern Bay-Sulina, Romania | 2575 
  map | 1974 or earlier |  | 3.0 m |  |  | Numerous specimens. | Mack-Fira V (1974): 263 | 
| I | Agigea, Romania, Black Sea | 2337 
  map | Aug 16, 1970 |  | 1.0 m | stone |  | Numerous specimens, Black Sea shore, a little quiet bay. | Mack-Fira V (1974): 263 | 
| J | Bassin d'Arcachon (Arcachon Bay), Aquitaine, France | 2941 
  map | Jan 1971 |  |  | sand |  | Camp Américaine.  sand beach slope, 6-7 m below the high water line.  leg. Dr. Westheide, det. U. Ehlers. | Ax P (1971): 213 | 
| K | Sandy beach on eastern shore of Sylt.  Litoralstation (old littoral station), Biological Institute Helgoland, Biologische Anstalt Helgoland (BAH), List, Sylt | 323 
  map | May 1969 |  |  | sand |  | sand flat.  leg.. U. Ehlers. | Ax P (1971): 213 | 
| L | Sandy beach on eastern shore of Sylt.  Litoralstation (old littoral station), Biological Institute Helgoland, Biologische Anstalt Helgoland (BAH), List, Sylt | 323 
  map | Sep 1969 |  |  | sand |  | sand flat.  leg.. U. Ehlers. | Ax P (1971): 213 | 
| M | Bottsand, Kiel Bay (Kieler Bucht;  Kielerbugt;  Nisler Bach), Germany | 2958 
  map | Jul 1966 |  |  | sand |  | Detritus rich sand in a calm bay. | Ax P (1971): 213 | 
| N | Gullmarfjord (Bredungen Gullmarsvik), western Sweden | 35 
  map | prior to 1948 | default type |  | mud, loam |  |  | Luther A (1948): from Hartog (citation)- p. 118 | 
| O | Slaak (Slaakdam), Provincie Zeeland, Netherlands | 3146 
  map | Feb 1962 |  |  |  |  | salt-marsh along the Slaakdam, St. Philipsland. | den Hartog C (1965): 119 | 
| P | Wissekerke, Provincie Noord-Beveland, Netherlands | 3147 
  map | Apr 1963 |  |  |  |  | small sandy salt-marsh east of the village. | den Hartog C (1965): 119 | 
| Q | Zeeuwsch Vlaanderen (Zeeuws Vlaanderen), Zuid-Beveland, Province of Zeeland, the Netherlands | 3127 
  map | Jun 1963 |  |  |  |  | International nature reserve "het Zwin" in the Dutch part.. | den Hartog C (1965): 119 | 
| R | De Paal (Paal), Zeeuwsch Vlaanderen (Zeeuws Vlaanderen), Province of Zeeland, the Netherlands | 3131 
  map | May 1963 |  |  |  |  | salt-marsh. | den Hartog C (1965): 119 | 
| S | Bergen op Zoom, Provincie Noord-Brabant, Netherlands | 3139 
  map | Oct 1964 |  |  |  |  | salt-marsh south of Bergen op Zoom.  (Bilio, personal communication) | den Hartog C (1965): 119 | 
| T | La Slack (Slack Riviere, La Slack Riviere), Nord Pas de Calais, France | 3148 
  map | May 1963 |  |  |  |  | Ambleteuse, ca. 10 km north of Boulogne-sur-Mer, in the estuary of the small river Slack. | den Hartog C (1965): 119 | 
| U | Kiel Bay (Kieler Bucht, Kieler Bay,  Kielerbugt,  Nisler Bach), Germany | 298 
  map | prior to 1951 | default type |  |  |  | common. | Ax P (1951): ; from Hartog (citation)- p. 101 | 
| V | North Frisian Islands, Germany | 3149 
  map | prior to 1951 | default type |  |  |  |  | Ax P (1951): ; from Hartog (citation)- p. 101 | 
| W | French Mediterranean coast, France | 3132 
  map | prior to 1956 |  |  |  |  | from "etangs" along the Mediterranean coast of France. | Ax P (1956): ; from Hartog (citation)- p. 101 | 
| X | Dokkumer Nieuwe Zijlen (Dokkumernieuwezijlen), in the Lauwersmeer (Lauwerszee), Province of Friesland, Netherlands | 3150 
  map | May 1961 |  |  |  |  |  | den Hartog C (1966): 101 | 
| Y | Zeeuwsch Vlaanderen (Zeeuws Vlaanderen), Zuid-Beveland, Province of Zeeland, the Netherlands | 3127 
  map | Jun 1963 |  |  |  |  | salt-marsh creek west of the Braakmanpolder. | den Hartog C (1966): 101 | 
| Z | Stavenisse, Tholen, Province of Zeeland, Netherlands | 3123 
  map | Apr 23, 1963 |  |  |  |  | Salt-marsh creek.  Creek runs through the salt-marsh of Stavenisse, found in several samples taken from the muddy sand bottom. It seems to be a member of the still-water association of detritus rich fine sand. | den Hartog C (1966): 119 | 
| A1 | inner Königshafen, Sylt Island, Germany, North Sea | 3616 
  map | May 1982 -Jul 1983 |  |  | sand |  | Königshafen.  Strandgebiet im inneren Konigshafen.  Dargestellt ist der Bereich zwischen 30 cm über und 30 cm unter der MHWL.  Senke. | Hellwig M (1987): 176 | 
| B1 | inner Königshafen, Sylt Island, Germany, North Sea | 3616 
  map | May 1982 -Jul 1983 |  |  | sand |  | Königshafen.  Strandgebiet im inneren Konigshafen.  Dargestellt ist der Bereich zwischen 30 cm über und 30 cm unter der MHWL.  Senke. | Hellwig M (1987): 176 | 
| C1 | Lister Hook (Lister Haken, Hakens), Sylt Island, Germany | 3619 
  map | Aug 1983 |  |  |  |  | Lister Haken, at the eulittoral-supralittoral transition belt of the lentic tidal coast.   lenitisch- bis schwach lotische Westseite, -25 cm bis +40 cm.    a) deichnaher geschützter, b) mittlerer, c) spitzhennaher exponierter Teil, jeweils 30 x 2 cm2 | Hellwig M (1987): 176 | 
| D1 | Koenigs Bay (Koenigshafens, Konigshafen, Königshafen), Sylt Island, Germany, North Sea | 3620 
  map | Jun 1983 |  |  | medium sand |  | Königshaften.  Zwei Sandufer eines Salzwiesenpriels, -5 bis + 30 cm, Mittelsand.  a) strömungsgeschützt, b) stärker exponiert, je 10 x 2 cm2. | Hellwig M (1987): 176 | 
| E1 | Nielönn, north of Kampen, Sylt Island, Germany, North Sea | 3613 
  map | Jul 1982 |  |  | mud |  | "Nielönn" bei Kampen.  Mündungsbereich zweier Priele, schlickig-schlammiger Boden, (5 bis 10 cm Wasserstand, 26-32 o/oo Salz), je 10 x 2 cm2. | Hellwig M (1987): 176 | 
| F1 | Raantem Inge, Rantum, Sylt Island, Germany, North Sea | 3614 
  map | Feb 1983 |  |  | medium sand |  | Rantum.   'Raantem Inge", Strand, Mittelsand, teilweise mit Kies durchsetzt, -20 bis +25 cm, 5 Probestellen zu 10 x 2 cm2. | Hellwig M (1987): 176 | 
| G1 | Raantem Inge, Rantum, Sylt Island, Germany, North Sea | 3614 
  map | Sep 1983 |  |  | mud, sand |  | Rantum.    Wattseite des Rantum-Beckens.  Spartina-Inseln auf Schlicksand bis Schlick, 10 x 2 cm2. | Hellwig M (1987): 176 | 
| H1 | Hornum-Ost (Hörnum, Hoernum), Sylt Island, Germany | 3617 
  map | Sep 1981 |  |  | medium-coarse sand |  | Hörnum, Nehrungshaken und Lagune.  Spartina auf Mittel- bis Grobsand, -15 bis + 30 cm, 8 x 10 cm2. | Hellwig M (1987): 176 | 
| I1 | Finnish Bay (Finnischen Meersbusen), Finland | 4056 
  map | 1974 or earlier |  |  |  |  | Karling (1974) meldet P. simplex von der schwedischen Ostseeküste und aus dem Finnischen Meerbusen. | Karling TG (1974): from Ax 2008 (citation)- p. 382 | 
| J1 | Schlei, Kieler Bay, Schleswig-Holstein, Germany | 2967 
  map | 1951 or earlier |  |  |  | 12-13 ppt | In Schleswig-Holstein siedelt die Art in der Schlei bei Lindauynis.  Salzgehalt 12-13 o/oo. | Ax P (1951): from Ax 2008 (citation)- p. 382 | 
| K1 | Schlei, Kieler Bay, Schleswig-Holstein, Germany | 2967 
  map | 1951 or earlier | default type |  |  | 12-13 ppt | In Schleswig-Holstein siedelt die Art in der Schlei bei Lindauynis.  Salzgehalt 12-13 o/oo. | Ax P (1951): from Ax 2008 (citation)- p. 382 | 
| L1 | Kristinebergsviken, Gullmarsfjorden, Sweden | 6037 
  map | Aug 7, 1940 | default type | 1-10 m | mud |  | Schwedische Westküste, Gullmaren, Kristinebergsviken, einige bis 10 m Tiefe, Mudboden | Luther A (1948): 75 | 
| M1 | Kristinebergsviken, Gullmarsfjorden, Sweden | 6037 
  map | Jul 12, 1941 |  | 1-10 m | mud |  | Schwedische Westküste, Gullmaren, Kristinebergsviken, einige bis 10 m Tiefe, Mudboden | Luther A (1948): 75 | 
| N1 | Gullmarfjord (Farlefjord, Gullmarsvik, Lysekil-Blabergsholem, Lysekil-Blåbergsholmen), western Sweden | 844 
  map | Mar 29, 1945 |  | 40 m | clay |  | Gullmaren, Lysekil-Blåbergsholmen, einige bis 10 m Tiefe, Tonboden, E. WESTBLAD | Luther A (1948): 75 | 
| O1 | Ria de Ondarroa, Spain | 6244 
  map | 1997-1999 |  |  |  | Brackish (meso) |  | Noreña C, Damborenea C, Faubel A & Brusa F (2007): 1992, 1994 |