|  | site | site # (info) | collection date | kind | depth | substrate | salin | comments | reference | 
| A | Weser # 2, Baden, Weser River, 20 km southeast of Bremen, Germany | 529 
  map | June 1990 to May 1991 |  |  | medium sand | 4-8 ppt |  | Düren R,  Ax P (1993): 267,273 | 
| B | Weser #1, Dedesdorf, Weser River, 25 km south of Bremerhaven, Germany | 528 
  map | June 1990 to May 1991 |  |  | medium sand | 7-11 ppt |  | Düren R,  Ax P (1993): 267,273 | 
| C | Sile (Artane, Chile, Schile, Kilia), Black Sea (Chernoe More, Chernoye More, Euxine Sea, Schwarzes Meer), Turkey | 817 
  map | Sep 23, 1956 |  |  | fine sand | 8.8 |  | Ax P (1959): 136 | 
| D | Geesthacht, Germany | 1623 
  map | May-Jul 1991 |  |  | sand, mud | freshwater | some specimens. sandy to muddy sediments, lenitic eulittoral area | Müller D, Faubel A (1993): 380, 381 | 
| E | Krauel, Germany | 1624 
  map | May-Jul 1991 |  |  | mud | freshwater | some specimens. muddy substrates covered with algae | Müller D, Faubel A (1993): 380, 381 | 
| F | Brokdorf, Germany | 1635 
  map | May-Jul 1991 |  |  | mud | brackish | some specimens.  eulittoral area of sandy sediment exposed to high currents; somewhat sheltered by groynes.  Supralittoral covered with Scirpus and Salix. | Müller D, Faubel A (1993): 380, 381 | 
| G | Koenigs Bay (Koenigshafens, Konigshafen, Königshafen), Sylt Island, Germany, North Sea | 491 
  map | Nov 1982 - Jun 1983 |  |  | mud |  | inner part Königshafen, a sheltered marine bay near the isle of Sylt. | Dittmann S, Reise K (1985): 99-100 | 
| H | Pocologan, New Brunswick, Canada | 3587 
  map | Aug-Sep 1984 |  |  | sand | brackish | brackish water bay.  Sand of the upper intertidal. | Ax P, Armonies W (1987): 62 | 
| I | Pocologan, New Brunswick, Canada | 3587 
  map | Aug-Sep 1984 |  |  | fine-medium sand | brackish | brackish water bay.  fine to medium sand next to a freshwater inlet. | Ax P, Armonies W (1987): 62 | 
| J | Pocologan, New Brunswick, Canada | 3587 
  map | Aug-Sep 1984 |  |  | mud, sandy mud | brackish | brackish water bay. | Ax P, Armonies W (1987): 62 | 
| K | Pointe de Miguasha, Baie des Chaleurs, Nouvelle, Avignon, Canada | 3593 
  map | Aug-Sep 1984 |  |  | coarse sand |  | Miguasha cliff.  Coarse sand rich in detritus of a marine low energy area. | Ax P, Armonies W (1987): 62 | 
| L | Petit Rocher, Elmtree River, Baie des Chaleurs, New Brunswick, Canada | 3597 
  map | Aug-Sep 1984 |  |  |  |  | Salt marsh sediment with Spartina and Salicornia species. | Ax P, Armonies W (1987): 62 | 
| M | Nösse (Nosse), Hindenburgdamm-Nord, Sylt Island, Germany, North Sea | 3607 
  map | 1982-1983 |  |  | fine sand, mud | brackish | supralitoral salt marsh. AR auf feinsandig-schlickigem Boden, 40 cm über MHWL. | Armonies W (1987): 98 | 
| N | Grosse Gröning, near List, Sylt Island, Germany, North Sea | 3612 
  map | 1982-1983 |  |  |  |  | salt meadow. | Armonies W (1987): 98 | 
| O | Nielönn, north of Kampen, Sylt Island, Germany, North Sea | 3613 
  map | 1982-1983 |  |  |  |  | salt meadow. | Armonies W (1987): 98 | 
| P | Hornum-Ost (Hörnum, Hoernum), Sylt Island, Germany | 3617 
  map | Mar 1983 |  |  | mud |  | Hörnum, Nehrungshaken und Lagune at the eulittoral-supralittoral transition belt of the lentic tidal coast.  Spartina auf Schlick bis Kleie. | Hellwig M (1987): 177 | 
| Q | 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): 177 | 
| R | site south of Keitum, Germany | 3615 
  map | 1982-1983 |  |  | sand |  |  | Hellwig M (1987): 177 | 
| S | Hornum-Ost (Hörnum, Hoernum), Sylt Island, Germany | 3617 
  map | Mar 1983 |  |  | mud |  | Hörnum, Nehrungshaken und Lagune.  Spartina auf Schlick bis Kleie, -20 bis + 20 cm, 30 x 2 cm2. | Hellwig M (1987): 177 | 
| T | Hangoudd (Hangöudd, Hankoniemi Cape, Poluostrov Khangeudd, Poluostrov Gangeudd), Hanko (Hangö, Hango, Hangonkyla, Khanko) Penninsula, Finnish Bay, Finland | 3037 
  map | prior to 1937 | default type | 5 m | fine sand |  | detritus rich sand. | Karling TG (1947): 52 | 
| U | eastern shore of Sylt Island, Germany | 4552 
  map | 1968-1970 |  |  |  |  |  | Hoxhold S (1974): 25 | 
| V | Greifswalder Bodden (Bay of Greifswald), Germany | 5473 
  map | 2001 |  |  |  | 6-7 ppt | Greifswalder Bodden.  Wieck.  Salzgehalt 6-7 o/oo (Unpubl.  2001). | Ax P (2008): 496 | 
| W | Bad Oldesloe, Schleswig-Holstein, Germany | 3467 
  map | 1961 or earlier |  |  |  |  | Scheswig-Holstein.  Bad Oldesloe.  Salzhaltige Binnengewässer. | Rixen J-U (1961): from Ax 2008 (citation)- p. 496 | 
| X | Niva Bay (Nivaa Bugt, Niva Bucht), Oresund (Öresund, Sund, Øresund, The Sound), Denmark | 5498 
  map | 1970 or earlier |  |  |  |  | Öresund.  Brackwasser der Niva Bucht.  Zusammen mit P. octaculeatus, aber sehr viel seltener als diese Art. | Straarup BJ (1970): from Ax 2008 (citation)- p. 496 | 
| Y | Alfred Wegener Institute, Wattenmeerstation, List, Sylt Island, Germany, North Sea | 5521 
  map | 1970 or earlier |  |  |  |  | Sylt.  Sandstrand am Ostufer vor der alten Wattenmeerstation des Alfred-Wegener-Instituts. | Schilke K (1970): from Ax 2008 (citation)- p. 496 | 
| Z | south western coast Netherlands (Holland, Niederlande) | 5512 
  map | 1977 or earlier |  |  |  |  | Niederlande.  Delta=Gebiet im Südwesten.  In isolierten, schwach brackigen, ehemaligen Aestuarien. | den Hartog C (1977): from Ax 2008 (citation)- p. 496 | 
| A1 | Belgium coast | 5471 
  map | 1989 or earlier |  |  |  |  | Belgische Küste.  Brackwasser. | Schockaert ER, Jouk PEH, Martens PM (1989): from Ax 2008 (citation)- p. 496 | 
| B1 | Courant de Lege (Lége), Cap Ferret, Bay of Arcachon (Bassin d'Arcachon), Aquitaine, France | 2946 
  map | Sep 1964 |  |  |  |  | Arcachon.  Süsswasserzufluss Courant de Lege.  Schlickboden mit Cyanobakterien am Ufersand. | Ax P (2008): 496 | 
| C1 | List, Litoralstation der Biologischen Anstalt Helgoland (12), Sylt, Germany | 6620 
  map | 1966-1968 |  |  |  |  | (leg. Hoxhold) | Schilke K (1970): 172 |