Microcaddisflies

Definition

A common name for the family Hydroptilidae, comprising the smallest caddisflies (order Trichoptera), typically under 5 mm in body length. Larvae construct distinctive portable cases from silk and minute environmental particles such as sand grains, algal filaments, or plant fragments, often with a curved, purse-like or spiral form distinct from the tubular cases of larger caddisfly families. Adults are recognized by reduced wing venation and hairy wings held roof-like over the body.

Etymology

From Greek mikros (small) + caddisfly, reflecting their minute size relative to other Trichoptera.

Example

Hydroptila icona and Hydroptila potosina are representative microcaddisflies in the genus Hydroptila, whose larvae spin silk cases reinforced with fine sand particles.

Synonyms

• Hydroptilidae

Related Terms

• caddisfly
• Trichoptera
• case-building
• Hydroptila
• aquatic insect
• lotic

Usage Notes

Microcaddisflies is an informal common name; formal taxonomic work uses Hydroptilidae. The family is the most species-rich within Trichoptera, though individual species are often difficult to identify due to small size and morphological reduction. Larval case morphology is frequently used in family-level identification of stream invertebrates.