Annulipalpia

Definition

A suborder of Trichoptera (caddisflies) characterized by adults bearing annulated (ringed) terminal segments of the maxillary palps and by larvae that typically construct fixed retreats—silk-lined shelters attached to substrate—rather than portable cases. The suborder comprises the bulk of caddisfly diversity, including the families Philopotamidae, Psychomyiidae, Polycentropodidae, and Hydropsychidae, among others.

Etymology

From Latin annulus (ring) + palpus (feeler, palp), referring to the ringed terminal segment of the maxillary palp.

Example

Hydropsychidae, the net-spinning caddisflies, are the most species-rich family within Annulipalpia; their larvae spin silken capture nets across flowing water to filter food particles.

Synonyms

• fixed-retreat makers

Related Terms

• Trichoptera
• Integripalpia
• Spicipalpia
• maxillary palp
• caddisfly
• case-making caddisfly

Usage Notes

Annulipalpia is one of three traditionally recognized suborders of Trichoptera, distinguished from Integripalpia (case-makers with unringed palps) and Spicipalpia (a smaller, more heterogeneous group). The fixed-retreat habit is diagnostic but not universal; some Annulipalpia construct portable cases or are free-living. Molecular phylogenetics has questioned the monophyly of traditional suborders, but Annulipalpia remains widely used in identification and ecological literature.