Stridulating Passalid vs Fleck-winged Hoverfly
Side-by-side species comparison
| Attribute | Stridulating Passalid | Fleck-winged Hoverfly |
|---|---|---|
| Scientific Name | Passalus punctatostriatus | Dasysyrphus albostriatus |
| Order | Coleoptera | Diptera |
| Family | Passalidae | Syrphidae |
| Size | 30-42 mm | 9-12 mm |
| Habitat | Woodlands | Woodlands |
| Diet | Wood Feeders | Wood Feeders |
| Regions | Central America, South America | Europe, Asia |
| Conservation | Least Concern | Least Concern |
Stridulating Passalid
A large, shiny black bess beetle with prominently punctate-striate elytra and strong mandibles. It lives in family groups within decaying logs. Known for producing a wide repertoire of stridulatory sounds for communication.
Did You Know?
Adults produce sounds by rubbing specialized ridges on the abdomen against the underside of the wings, creating at least 14 distinct calls.
Fleck-winged Hoverfly
A woodland hoverfly with white crescent markings on a dark abdomen. It is one of the earliest hoverflies to appear in spring.
Did You Know?
It is sometimes called the white-striped hoverfly because of the distinctive pale marks on its dark abdomen.