External-feeder
Guides
Arge quidia
Willow Oak Sawfly
Arge quidia is a sawfly species in the family Argidae, described by Smith in 1989. It is commonly known as the Willow Oak Sawfly, indicating an association with willow oak (Quercus phellos) or related oak species. The species has been documented in eastern Canada, specifically Ontario and Quebec. As a member of the suborder Symphyta, adults lack the narrow waist characteristic of most other Hymenoptera. Larvae of Argidae are typically external leaf feeders on woody plants.
Dolerus
Dolerus is a genus of sawflies in the family Tenthredinidae, subfamily Selandriinae. Species occur in Europe and North America. Larvae of multiple species have been documented feeding on Equisetum (horsetails) and grasses, with some species showing specialized host associations. The genus includes several subgenera, notably Equidolerus and Achaetoprion, which have been subject to recent taxonomic revision.
Schizocerella lineata
Outer Purslane Sawfly
Schizocerella lineata is a sawfly species in the family Argidae, historically confused with S. pilicornis until mitochondrial DNA analysis confirmed their separation in 2007. Unlike its congener, whose larvae are internal leaf miners, S. lineata larvae feed externally on purslane leaves. The species occurs widely across the New World from southern Canada to at least Central America, with multiple generations annually in warmer regions.