Rust Flies

Psilidae

Classification

Phylum: Arthropoda
Subphylum: Hexapoda
Class: Insecta
Order: Diptera
Superfamily: Diopsoidea
Family: Psilidae

Pronunciation

How to pronounce Psilidae: /ˈsaɪlɪˌdiː/

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Summary

Psilidae, commonly known as the rust flies, are a family of dipteran insects with approximately 38 identified species. They are primarily phytophagous and are often found in temperate zones, where they inhabit low-density vegetation. The larvae of these flies typically live in plant structures and some species are known pests in agricultural settings.

Physical Characteristics

Small to medium-sized flies, 1.5 mm to 10 mm in length. Body colors vary from yellow to reddish, brown, or black. Spherical head with small eyes, slanted face, small antennae, and elongated third antennal segment. Wing usually clear to slightly tinged with possible dark bands along the costa, wing tip, or cross-veins. The costa is interrupted from R1 and the anal cell has a straight outer border.

Identification Tips

Look for small to medium-sized size, slender body shape, and unique wing venation patterns. The absence of vibrissae and the presence of ocelli and ocellar bristles are also key characteristics.

Habitat

Common in cool places with low-density vegetation; well represented in temperate zones.

Distribution

Primarily found in the Holarctic region, including Western Palaearctic (Russia, Turkey), Nearctic, and Japan.

Diet

Phytophagous larvae that typically feed on nonwoody plants; some species feed within stems, tubers, or roots.

Life Cycle

Life cycle details largely unknown, but larvae develop inside plant tissues and some may form galls.

Ecosystem Role

Some species serve as pests in agriculture and horticulture.

Economic Impact

Certain species, like Chamaepsila rosae and Psila nigricornis, are considered pests affecting crops and gardens.