Cephalcia fulviceps

Differs from other Cephalcia species by the combination of fulvous (tawny yellow-brown) head coloration and specific antennal segment proportions. Accurate identification requires examination of genitalic morphology and comparison with type specimens.

Associated with coniferous forests, particularly stands of spruce (Picea) and fir (Abies). Larvae construct silk webbing on host branches.

Documented from Europe; specific range details require verification from primary sources.

Adults active in spring and early summer; larval development occurs through summer months.

Larvae feed on conifer needles, primarily of spruce and fir species.

• Picea - larval food plantprimary host
• Abies - larval food plantsecondary host

Complete metamorphosis with egg, larva, pupa, and adult stages. Larvae are gregarious and construct communal silk webs on host branches for protection while feeding. Pupation occurs in soil or leaf litter.

Larvae exhibit gregarious feeding behavior and produce extensive silk webbing on host branches. Adults are not known to feed.

Herbivore in coniferous forest ecosystems. Larval feeding can cause localized defoliation of host trees. Serves as prey for birds and parasitoid wasps.

Occasional forest pest when populations are high; larval webbing and defoliation may reduce aesthetic value of ornamental conifers. Not a significant economic pest.

• Cephalcia arvensisOverlaps in distribution and host use; distinguished by head coloration and antennal proportions
• Cephalcia fallaxSimilar conifer-associated ecology; requires genitalic examination for definitive separation

• sawfly
• Pamphiliidae
• conifer pest
• web-spinning sawfly
• European

• BugGuide
• iNaturalist taxon