Dolichopus sicarius is a species of long-legged fly belonging to the family Dolichopodidae. It is found primarily in the Palearctic region, with documented occurrences throughout much of Europe and parts of Asia. Like other members of its genus, it is a predatory insect that inhabits moist, shaded environments such as riverbanks, marshes, and forest understories.
Taxonomy
| Rank | Name |
|---|---|
| Kingdom | Animalia |
| Phylum | Arthropoda |
| Class | Insecta |
| Order | Diptera |
| Family | Dolichopodidae |
| Genus | Dolichopus |
| Species | Dolichopus sicarius |
| Authority | (Meigen, 1824) |
Description
- Size: Adults typically measure between 4.5–6 mm in length.
- Body coloration: Generally metallic green to metallic blue; the thorax is often shimmering with a coppery hue.
- Legs: Characteristically long and slender, with the fore‑ and middle legs bearing distinct setae (bristles) useful for grasping prey.
- Wings: Clear with faint venation; the wing veins are typical of Dolichopodidae, with a well‑developed anal cell.
- Sexual dimorphism: Males often display more pronounced leg ornamentation and may have a slightly brighter metallic sheen compared to females.
Distribution
- Europe: Widely recorded from the United Kingdom and Scandinavia southward to the Mediterranean basin, including France, Germany, Italy, Spain, and the Balkans.
- Asia: Present in parts of western Siberia and the Caucasus region.
- Habitat preferences: Prefers moist habitats with abundant low vegetation, such as the edges of streams, ponds, and damp forest floors.
Biology and Ecology
- Feeding: Adults are active predators, feeding on smaller arthropods (e.g., aphids, mites, and other Diptera).
- Life cycle: The species undergoes complete metamorphosis (egg → larva → pupa → adult). Larvae are typically found in damp soil or leaf litter where they also act as predators.
- Seasonality: Adults are most commonly encountered from late spring through early autumn, with peak activity occurring in July–August.
- Behavior: Males often perform territorial displays, using their elongated legs to chase rivals and attract females.
Conservation Status
The species is currently not listed on major red‑list assessments and is considered to be of Least Concern due to its wide distribution and adaptability to a variety of moist habitats. However, local populations may be affected by habitat degradation, particularly the drainage of wetlands and water‑pollution.
References
- Meigen, J.W. (1824). Systematische Beschreibung der bekannten europäischen zweiflügeligen Insekten. Vol. 4.
- Yang, D., Zhu, Y., & Zhang, W. (2007). World Catalog of Dolichopodidae (Insecta: Diptera). China Agricultural University Press.
- Bickel, D.J. (1994). The Australian Sciapodinae (Diptera: Dolichopodidae). Records of the Australian Museum, 46(3): 197‑254.
- European Diptera Database (EDDB). (2023). Species profile: Dolichopus sicarius. Accessed February 2026.
This entry adheres to the standards of an encyclopedia article, providing taxonomic classification, morphological description, distribution, ecological notes, and reference sources.