Tenthredinini

Tenthredinini sawflies can be distinguished from related tribes by a combination of wing venation patterns and genitalic structures. The tribe generally exhibits more robust body proportions compared to the tribe Tenthredopsini. Members of Tenthredo display striking aposematic coloration in yellow, black, and orange patterns that mimic stinging Hymenoptera. The forewing possesses a distinct anal cell, a characteristic shared with other Tenthredininae but with specific venation details diagnostic at tribal level.

Found in diverse terrestrial habitats including meadows, forest edges, wetlands, and gardens. Larval habitat specificity depends on host plant distribution. Adults frequent flowering vegetation in open to semi-open environments.

Holarctic distribution with primary diversity in the Palearctic region. The genus Tenthredo is widespread across Europe and Asia, with extension into North America. Genus Rhogogaster is predominantly Palearctic. Genus Lagium has limited distribution in central and eastern Asia. Genus Tyloceridius is restricted to the Oriental region.

Adult activity primarily during spring and summer months, with peak emergence varying by latitude and elevation. Most species are univoltine, with adult flight periods concentrated from May to August in temperate regions.

Larvae feed externally on leaves of diverse angiosperm hosts including Rosaceae, Betulaceae, Salicaceae, and herbaceous plants. Specific host associations vary by species. Adults consume nectar and pollen from flowers.

• Rosaceae - larval hostincluding Rubus, Fragaria, and various shrubs
• Betulaceae - larval hostincluding Betula and Alnus
• Salicaceae - larval hostincluding Salix and Populus
• Flowering plants - adult food sourcenectar and pollen

Holometabolous development with four stages: egg, larva, pupa, and adult. Eggs are inserted into leaf tissue or deposited on leaf surfaces. Larvae feed externally on foliage, typically completing development in several weeks. Pupation occurs in soil or leaf litter within a cocoon. Overwintering stage varies, with most species pupal or prepupal diapause.

Larvae are solitary external feeders, often resting curled on leaf edges when disturbed. Adults are diurnal and frequently observed on flowers, exhibiting slow, hovering flight. Many species display Batesian mimicry of aculeate Hymenoptera, with corresponding wasp-like flight patterns.

Larvae function as primary consumers, defoliating host plants and contributing to nutrient cycling. Adult flower visitation supports pollination. Larvae serve as prey for parasitoid wasps and vertebrate predators. Some species reach pest status in agricultural or horticultural settings when populations are high.

Some species cause minor defoliation damage to berry crops, roses, and ornamental plants. The conspicuous adults are frequently photographed and contribute to citizen science records. No sting or venom present despite warning coloration.

• TenthredopsiniSimilar overall morphology but distinguished by more slender body form, different wing venation details, and generally less vivid coloration
• AllantiniOverlapping host plant use but distinguished by larval feeding habits and adult genitalic morphology
• AthaliiniSimilar flower-visiting behavior but distinguished by larval morphology and host plant associations

Despite frequent wasp-like yellow and black coloration, Tenthredinini sawflies lack a stinger and cannot sting humans. The warning coloration represents Batesian mimicry of defensive aculeates rather than genuine aposematism.

• sawfly
• herbivore
• flower visitor
• mimicry
• defoliator

• BugGuide
• Wikipedia
• iNaturalist taxon