| site | site # (info) | collection date | kind | depth | substrate | salin | comments | reference | |
|---|---|---|---|---|---|---|---|---|---|
| A | Jordsand Island (Denmark), (North Frisian Islands), North Sea | 311 | July, August 1975 | type locality | south of Vogelschutzinsel Jordsand (Denmark), numerous specimens | Faubel A (1976): 35 | |||
| B | Sylt Island (North Frisian Islands), North Sea | 313 | July/August 1975 | Faubel A (1976): 35 | |||||
| C | Jordsand Island (Denmark), (North Frisian Islands), North Sea | 311 | 1972-1975 | clean sand flat | Faubel A (1977): 68-69, Table 1 |