Genus: Bitrichia
| Year | Arter/grupper | Localities | Participants | Observations |
|---|---|---|---|---|
| 1996 | 1 | 2 | 3 | 4 |
| 1994 | 2 | 3 | 3 | 4 |
| 1993 | 1 | 7 | 7 | 8 |
| 1991 | 1 | 16 | 16 | 19 |
| 1990 | 3 | 20 | 21 | 41 |
| 1989 | 2 | 15 | 15 | 15 |
| Totalt alle år | 4 | 46 | 48 | 91 |
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Responsible editor: Doris Jorde