|  | site | site # (info) | collection date | kind | depth | substrate | salin | comments | reference | 
| A | Ile aux Oiseaux,  Bay of Arcachon (Bassin d'Arcachon), Aquitaine, France | 2952 
  map | Sep 1964 | default type |  | mud sand |  | in association with Zostera nana. | Ax P (1971): 157 | 
| B | Region of Lege (Lége), Bay of Arcachon (Bassin d'Arcachon), Aquitaine, France | 2953 
  map | Sep 1964 | default type |  | soft mud |  | in association with Zostera nana. | Ax P (1971): 157 | 
| C | Ile de Callot, Roscoff, France | 3303 
  map | Sep 19, 1973 |  |  | fine muddy sand |  | eulittoral of the west side of the Ile de Callot (200 m to the left of the Church), near the low tide-level.  Living specimens, four whole mounts. | Ehlers U (1980): 160 |