Finger-net caddisflies

Definition

A family of caddisflies (Trichoptera: Philopotamidae) whose larvae construct distinctive, elongate, finger-like or tubular silk nets to capture drifting food particles in running water. The common name refers to the net shape rather than any body structure.

Etymology

Common name from the elongated, finger-like or tubular silk nets constructed by larvae; family name Philopotamidae from Greek 'philos' (loving) + 'potamos' (river), referring to their lotic habitat preference.

Example

Larvae of the finger-net caddisfly genus Chimarra spin silk tubes 2–5 cm long, positioning them in swift currents where the narrow aperture creates a Venturi effect, drawing fine particulate organic matter into the net for filter-feeding.

Synonyms

• Philopotamidae

Related Terms

• caddisfly
• Trichoptera
• Net-spinning caddisflies
• filter-feeding
• lotic
• silk
• Chimarra
• Dolophilodes
• benthic macroinvertebrate

Usage Notes

The common name applies to the family Philopotamidae specifically, not to all net-building caddisflies; other families such as Hydropsychidae construct more planar or funnel-shaped nets. Specialists generally prefer the family name Philopotamidae in formal contexts. Larvae are important indicators of well-oxygenated, unpolluted streams.