Lepidostomatidae

Definition

A family of caddisflies (order Trichoptera) characterized by diverse larval body forms and widespread global distribution. Larvae are typically aquatic or semiaquatic, inhabiting streams, seeps, and moist terrestrial habitats where they construct portable cases from plant material, sand grains, or silk. The family was established by Georg Ulmer in 1903 and represents one of the more speciose and ecologically variable lineages within the Integripalpia, with larvae showing considerable morphological plasticity correlated with habitat type.

Etymology

From Greek lepis (scale) + stoma (mouth), referring to scaled mouthparts characteristic of the group; family suffix -idae.

Example

Larvae of Lepidostoma (the type genus) build curved, tapered cases from spirally arranged plant fragments, whereas some Lepidostomatidae in intermittent streams construct flattened, shield-like cases from silk and fine detritus to resist desiccation.

Related Terms

• Trichoptera
• Integripalpia
• caddisfly
• case-building
• aquatic insect
• lotic ecology
• Ulmer

Usage Notes

Distinguished from other caddisfly families by larval case architecture and adult genitalic characters; larvae often identified by case morphology and the presence of a dorsal hump on abdominal segment I. The family's ecological breadth—spanning permanent streams to temporary wetlands—makes it useful for biomonitoring across diverse freshwater systems.