Periscelididae

Pronunciation

How to pronounce Periscelididae: //ˌpɛrɪˈskɛlɪdɪdiː//

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Summary

Periscelididae is a family of small flies, with approximately 90 species across 11 genera. Characterized by their strong postocellar setae and a physical morphology adapted to feeding on tree sap, they are rarely encountered in the wild.

Physical Characteristics

Periscelididae are small flies, measuring 3–4 mm long. The head is distinctly broader than high, with a broad and bulging cheek posteriorly. The postocellar bristles are strong and diverging, and there are two orbital bristles on each side of the frons. The anterior orbital bristle is directed forward towards the median line. They have well-developed vibrissae and two pairs of dorsocentral bristles on the mesonotum. The wing has fused posterior basal and discoidal cells, is clear or milky with infuscated spots, and the anal vein does not reach the wing margin. Tibiae are usually banded and lack dorsal preapical bristles.

Identification Tips

Look for the strong, diverging postocellar bristles and the distinct mouthpart structure, as well as the small overall size of 3–4 mm.

Habitat

Periscelididae are typically found near sap oozing from wounded trees. They are rarely encountered, indicating a specialized habitat.

Distribution

West Palaearctic including Russia; documented in Japan; and part of a world list.

Diet

Diet consists mainly of sap from wounded trees, suggesting a saprophagous feeding behavior.

Tags

• Periscelididae
• Diptera
• flies
• insects