Farula praelonga

Long-tailed Caddisfly

Family: Uenoidae · Class: Insecta · Order: Trichoptera

Conservation status: G1G2 S1S2

The long-tailed caddisfly (Farula praelonga) is an aquatic insect in the family Uenoidae, subfamily Uenoinae. Adults are characterized by elongated antennae that can exceed body length, giving the species its common name. Like other members of the Trichoptera order, adults have tent-like wings held over the body when at rest and reduced mouthparts adapted for feeding on liquids rather than solid food. Farula praelonga occurs in California, where it is associated with small Sierran streams. The species has an overlapping distribution with Neothremma genella, another caddisfly found in similar Sierra Nevada habitats (NatureServe Explorer). The exact range boundaries and elevation preferences for F. praelonga have not been well documented in available literature. The species inhabits small streams in the Sierra Nevada mountains. Like other Uenoidae family members, larvae likely construct cases from small stones and organic debris, attaching to rocks and other hard substrates in flowing water. Adult caddisflies generally remain near emergence sites where mating and egg-laying occur, with dispersal typically limited to within five kilometers of the natal stream (Kovats et al. 1996). Dispersal distances tend to be shorter in areas with dense forest canopy compared to more open vegetation. Larval ecology of F. praelonga appears to follow typical caddisfly patterns, with aquatic immature stages feeding on algae, detritus, and small invertebrates while constructing protective cases. Adults emerge from pupae in late spring or summer, depending on water temperature and photoperiod. Mating swarms typically form near water, with females returning to streams to deposit eggs. The species likely has a one-year life cycle, though specific timing and reproductive details have not been documented. Farula praelonga has a global rank of G1G2 (critically imperiled to imperiled) and a state rank of S1S2 in California, indicating very high conservation concern. The species faces potential threats common to stream-dependent insects, including water diversions, pollution, climate change effects on snowpack and stream flow, and habitat degradation from human activities. Small Sierran streams are particularly vulnerable to temperature increases and altered precipitation patterns associated with climate change. The species' apparently limited distribution and specific habitat requirements make it especially sensitive to environmental changes. Detailed ecological studies and systematic surveys are needed to better understand the species' distribution, abundance, and specific habitat requirements. This species is included on the California Department of Fish and Wildlife's Special Animals List. Current knowledge gaps include precise range boundaries, population size estimates, and detailed life history information. The species' conservation status reflects the precautionary principle given limited data and potential threats to Sierra Nevada stream ecosystems. Scientific documentation for this species remains limited compared to more widespread caddisfly species.

Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, and more.