Saddle-case makers

Definition

A guild of caddisfly larvae (order Trichoptera) that construct portable, saddle-shaped cases by silk-binding two curved, shield-like pieces of leaf, bark, or other plant material, one dorsal and one ventral, leaving the head and legs exposed at each end for feeding and locomotion. The case design is lightweight, streamlined, and offers protection while permitting movement through water.

Etymology

From the saddle-like appearance of the two curved case pieces that arch over the larva's body.

Example

Larvae of the family Glossosomatidae are classic saddle-case makers; each larva drags its tiny, curved shell of sand grains or plant fragments along stream bottoms, grazing on periphyton.

Synonyms

• saddle-case caddisflies

Related Terms

• case-making caddisflies
• tube-case makers
• spiral-case makers
• Trichoptera
• benthic invertebrates
• functional feeding groups
• periphyton grazers

Usage Notes

The term describes a case-building guild rather than a formal taxonomic group; saddle-case makers occur primarily in the families Glossosomatidae and some Helicopsychidae. Contrasts with tube-case makers (elongate cylindrical cases) and purse-case makers (flattened, purse-like cases). The case architecture is diagnostic for field identification of larvae to family level in stream biomonitoring.