|  | site | site # (info) | collection date | kind | depth | substrate | salin | comments | reference | 
| A | south beach Dune (Duehne), Helgoland Island, Germany | 746 
  map | Aug 1963 |  |  | medium sand |  |  | Dorjes J (1968): 409; also biogeography and ecology on this and other German Bay species in (citation)- 78-115. | 
| B | Herdla (Herlo), off  Bergen, Norway | 56 
  map | prior 1975 |  | 5 m | mud |  |  | Dorjes J, Karling TG (1975): 187 | 
| C | Gullmaren, Fiskebackskil (Fiskebäckskil), western Sweden | 23 
  map | prior 1975 |  | 5-10 m | mud |  |  | Dorjes J, Karling TG (1975): 187 | 
| D | Yealm Estuary, Plymouth, England | 1713 
  map | prior 1975 |  |  | mud |  | and Jenny Cliff. | Dorjes J, Karling TG (1975): 187 | 
| E | Tvarminne (Tvärminne, Tverminne, Tvaerminne), Kvarnskar (Kvärnskar), Finnish Bay, Finland | 886 
  map | prior 1975 |  | 1-2 m | sand |  |  | Dorjes J, Karling TG (1975): 187 | 
| F | Gullmarfjord, by Bay of Kristineberg, Sweden | 836 
  map | prior 1975 | type locality | 5-10 m | mud |  |  | Dorjes J, Karling TG (1975): 187 |