Epistrophe grossulariae

Distinguished from similar Epistrophe species by the entirely black antennae and arista (the 'black-horned' trait). Differs from Epistrophe eligans by abdominal patterning: E. grossulariae has more uniform, less extensively yellow-marked tergites. Separated from Epistrophe nitidicollis by thoracic coloration and leg markings. Male genitalia provide definitive identification where examination is possible.

Medium-sized hoverfly with a smooth, somewhat elongated abdomen. The species exhibits the characteristic 'smoothtail' morphology of the genus Epistrophe, with relatively unmarked tergites. Antennae are black with distinctive black arista, contributing to the common name 'Black-horned'. Wing venation includes a characteristic loop in the R4+5 vein typical of Syrphinae.

Associated with deciduous woodland edges, hedgerows, and scrubland. Adults frequent flowering vegetation in semi-open habitats. Larval habitat inferred from related species: likely arboreal, associated with aphid colonies on trees and shrubs.

Holarctic distribution. Well-documented in Europe, with confirmed presence in Belgium (Flanders, Brussels-Capital Region, Walloon Region). Records span northern and central Europe; exact eastern and North American limits require verification.

Adult flight period primarily late spring through summer, with peak activity typically June–August in temperate regions. Exact phenology varies with latitude.

Complete metamorphosis with egg, larva, pupa, and adult stages. Larvae are presumed aphid predators based on genus-level traits in Syrphini, though direct documentation for this species is limited.

Adults visit flowers for nectar and pollen. Flight behavior typical of hoverflies: hovering capability with rapid directional changes. Males exhibit territorial patrolling behavior near sunlit vegetation.

Adults contribute to pollination through flower visitation. Larval stage likely functions as aphid predator, providing biological control of tree-dwelling aphid populations.

No direct economic significance. Valued as pollinator and potential biocontrol agent. Frequently recorded by citizen scientists, contributing to hoverfly monitoring programs.

• Epistrophe eligansSimilar size and general appearance, but E. eligans has more extensively yellow-marked abdominal tergites and partially pale antennae.
• Epistrophe nitidicollisOverlapping distribution and habitat; distinguished by thoracic dorsum coloration and leg patterning.
• Epistrophe melanostomaClose congener with subtle differences in facial markings and genitalia structure.

• hoverfly
• syrphid
• pollinator
• aphid predator
• Holarctic
• Europe
• woodland

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy