Melieria

Species occupy diverse wetland habitats ranging from coastal saltmarshes and brackish marshes to inland wetlands and pond margins. Coastal species occur in upper saltmarsh zones dominated by Saltmarsh Rush (Juncus gerardii) and Saltmarsh Grass (Puccinellia maritima), as well as brackish ditches with Sea Clubrush (Bolboschoenus maritimus). Inland species inhabit swampy areas dominated by reed sweet-grass (Glyceria maxima) and vegetation bordering ponds and streams including Yellow Flag and Water Hemlock.

Palaearctic distribution with European concentration. Records from Denmark, Norway, Sweden, Netherlands, France, Germany, Ukraine, Austria, Hungary, Belgium, and England. Within Britain, predominantly southern distribution with coastal concentration in south and east England (Solent, Thames Estuary, Wash, Humber Estuary) and scattered western records; some species with inland populations in regions such as Cambridgeshire Fens. No confirmed Scottish records for some species; absent from Ireland.

Adults on the wing from May to August, with peak activity typically June to July. Seasonal timing consistent across multiple species.

• Elytrigia atherica (sea couch) - suggested larval hostBased on observations of mating pairs and adult behaviors exclusively on this plant; recorded in large numbers in Dutch coastal marshes. Association inferred from adult behavior, not confirmed larval biology.
• Artemisia maritima (sea wormwood) - rejected associationEarlier suggested association explicitly rejected by field observations.
• Phragmites australis (common reed) - larval developmentLarvae reported to develop in reed stems for M. omissa and M. crassipennis, though immature stages remain unknown for M. omissa.
• Glyceria maxima (reed sweet-grass) - habitat associationSwampy areas dominated by this plant serve as habitat for M. crassipennis.

Adult stage well-documented with May–August flight period. Larval biology remains poorly understood for most species; immature stages explicitly unknown for M. omissa. Larvae reported to live in stems of common reed (Phragmites australis) for some species, with development in other decaying plant matter also suggested. Life cycle details limited and noted as 'poorly understood' in sources.

Mating pairs and other adult behaviors observed exclusively on host plants for some species. M. picta appears more thermophilic than M. cana.

• M. crassipennisDistinguished from M. omissa by dark posterior margins on abdominal tergites; M. omissa has unicoloured abdominal tergites.
• Other Melieria speciesM. omissa distinguished by broadly darkened femora present in other species but absent in M. omissa; M. picta distinguished by fusion of two apical wing spots forming large wing spots and dark bands along posterior tergite margins.

• picture-winged fly
• Ulidiidae
• wetland
• saltmarsh
• genome sequenced

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• The genome sequence of a picture-winged fly , Melieria omissa (Meigen, 1826) (Diptera: Ulidiidae).
• The genome sequence of a picture-winged fly, Melieria picta (Meigen, 1826) (Diptera: Ulidiidae).
• The genome sequence of a picture-winged fly, Melieria crassipennis (Fabricius, 1794).