Family: Heliozelidae
The abundance is indicated as follows:
| - | Not recorded in the two counties |
| ! | Rarely reported (<10 records on database) |
| O | Occasional (11-100 records on database) |
| OO | Regular (101-200 records on database) |
| OOO | Common (201-1000 records on database) |
| OOOO | Very common (1000 - 5000 records on database) |
| OOOOO | Abundant (over 5000 records on database) |
