|  | site | site # (info) | collection date | kind | depth | substrate | salin | comments | reference | 
| A | Gullmarfjord, Bokevik (Bökevik, Bökovik), Sweden | 862 
  map | prior to 1946 | type locality | 15 m |  |  | not common, no type locality specified. | Westblad E (1946): 41 | 
| B | Gullmarfjord (Blabergsholem, Blåbergsholmen, Blåbärsholmen, Blabarsholmen), western Sweden | 856 
  map | prior to 1946 | type locality | 25-35 m | clay (Lehmboden) |  | not common, no type locality specified. | Westblad E (1946): 41 | 
| C | Eyjafjordur (Eyjafjördur), Iceland, | 47 
  map | Jul 10, 19, 1947 | default type | 5-10 m |  |  | 8 specimens | Westblad E (1955): 501 |