St Mark's Fly vs Latrine Fly
Side-by-side species comparison
| Attribute | St Mark's Fly | Latrine Fly |
|---|---|---|
| Scientific Name | Bibio johannis | Fannia scalaris |
| Order | Diptera | Diptera |
| Family | Bibionidae | Fanniidae |
| Size | 6-10mm | 5-7 mm |
| Habitat | Underground | Wetlands |
| Diet | Root Feeders | Scavengers |
| Regions | Europe | Worldwide |
| Conservation | Least Concern | Least Concern |
St Mark's Fly
A small black fly that swarms in May. Males have large heads with huge eyes that almost meet on top.
Did You Know?
Often confused with the larger Bibio marci but emerges slightly later and has entirely dark legs.
Latrine Fly
A small fly that breeds in excrement and decaying organic matter in latrines and drains. It can cause urogenital myiasis when larvae enter the urinary tract.
Did You Know?
Its flattened, spiny larvae are among the few fly species documented to cause urinary myiasis in humans.