| J | F | M | A | M | J | J | A | S | O | N | D | Country | Locality |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 111 | 111 | Arctic areas | |||||||||||
| 111 | 111 | 111 | France | Central and northeast quarter of France | |||||||||
| 111 | 111 | 111 | 111 | 111 | 111 | 111 | Central Europe | ||||||
| 111 | 111 | 111 | 111 | 111 | Germany | In rivers, creeks and ditches. | |||||||
| 111 | 111 | 111 | Not specified | ||||||||||
| 111 | 111 | 111 | 111 | UK | Not stated | ||||||||
| 111 | 111 | 111 | 111 | 111 | 111 | Poland | Puck Bay, Gulf of Gda?sk, 1993, 1995-96 |