Blephariceridae

Definition

A family of nematoceran flies (order Diptera) commonly known as net-winged midges. Adults are distinguished from superficially similar crane flies (Tipulidae) by a projecting anal angle in the wing, modified head shape, absence of a V-shaped suture on the mesonotum, and legs held laterally outstretched in a forward-facing posture. Larvae are specialized for life in torrential mountain streams, using ventral suckers to cling to rocks in fast-flowing water. The family comprises over 200 described species in dozens of genera distributed worldwide, with highest diversity in temperate and tropical montane regions.

Etymology

From Blepharicera, the type genus (Greek blepharis 'eyelash' + kera 'horn'), + -idae (family suffix).

Example

Blephariceridae larvae are obligate inhabitants of high-gradient streams, where their six ventral suckers allow attachment to submerged stones in currents exceeding 2 m/s; adult Blepharicera species emerge synchronously in spring to mate on riparian vegetation.

Synonyms

• net-winged midges

Related Terms

• Diptera
• Nematocera
• Tipulidae
• Blepharicerinae
• Edwardsininae
• torrenticolous
• rheophilic

Usage Notes

Distinguished from crane flies by wing venation and leg posture, not merely habitat. The common name 'net-winged midges' refers to the reticulate wing venation visible in many species, though this trait varies. Specialist literature often emphasizes larval ecology over adult morphology due to the family's strict dependence on pristine lotic habitats.