Spicipalpia

Definition

A suborder of Trichoptera (caddisflies) characterized by adults with pointed, spine-like maxillary palps. The group comprises four families—Glossosomatidae, Hydroptilidae, Philopotamidae, and Psychomyiidae—whose larvae exhibit diverse habits: free-living, retreat-making, or case-building, though all construct pupal cases by the final instar. Molecular phylogenetics indicates Spicipalpia is likely paraphyletic, with families distributed across the caddisfly tree rather than forming a single clade.

Etymology

From Latin spica (spike, point) + palpus (palp, feeler), referring to the pointed maxillary palps diagnostic of adults.

Example

The hydroptilid caddisfly Ochrotrichia tenuata, a member of Spicipalpia, builds a portable silken case in its final larval instar before pupation, contrasting with the fixed retreats of philopotamids in the same suborder.

Related Terms

• Trichoptera
• Integripalpia
• Annulipalpia
• maxillary palp
• caddisfly case
• aquatic insect

Usage Notes

Spicipalpia has been recognized in traditional morphology-based classifications but is increasingly treated as an artificial grouping in modern systematics. The pointed palp character appears to be plesiomorphic or convergent rather than synapomorphic. When discussing caddisfly phylogeny, specialists may refer to constituent families directly rather than the suborder. Contrast with Integripalpia (case-makers with complete pupal cases) and Annulipalpia (net-spinning caddisflies with annulated palps).