Thremmatidae

Larvae distinguished from other caddisfly families by combination of: shape of mesonotal sclerites, foretrochantins, forefemora, and ventral sclerites on abdominal segment I; head coloration patterns; and case morphology. European Thremma species specifically require examination of these characters for differentiation.

Streams, particularly in montane regions. Documented from streams draining the Cypress Hills in Saskatchewan, Canada.

Europe (at least four Thremma species); North America including montane regions of British Columbia, Canada; Utah, United States; and Saskatchewan, Canada.

Larval activity begins by early May in Saskatchewan populations; pre-pupal diapause occurs mid-June to mid-September.

Larvae construct cases; pre-pupal diapause of approximately three months has been documented in Neophylax splendens (mid-June to mid-September).

Larvae construct portable cases; pre-pupal diapause observed as a seasonal survival strategy.

• LimnephilidaeThremmatidae was historically classified as subfamily Neophylacinae within Limnephilidae; separated based on phylogenetic analysis of morphological characters linking Thremmatidae with Uenoidae instead.
• Uenoidae (sensu stricto)Now classified together within expanded Uenoidae family; Uenoinae subfamily (Uenoa, Sericostriata, Neothremma, Farula) distinguished from Thremmatinae (Thremma, Neophylax, Oligophlebodes) by morphological characters with predictive value for behavior and ecology.

• caddisfly
• Trichoptera
• case-building
• diapause
• montane streams

• BugGuide
• GBIF taxonomy match
• Discriminatory matrix for the larvae of the European Thremma species (Trichoptera: Thremmatidae)
• Further revision of the caddisfly family Uenoidae (Trichoptera): evidence for inclusion of Neophylacinae and Thremmatidae
• Extended family: a caddisfly new to Saskatchewan, Canada with notes on the life history ofNeophylax splendens(Trichoptera: Thremmatidae)