Small to medium-sized sawflies up to 20 mm long; antennae usually with nine segments; antennae simple, but projections present on basalmost segments in the genus Cladius (Fig. 151); thorax with a distinct postscutellum. A very diverse group, including many parthenogenetic species; eggs are usually laid in plant tissue, the female using her saw-like ovipositor (Fig. 152) to
cut small incisions in leaves, shoots, etc. Larvae eruciform, with three pairs of thoracic legs and, usually, six to eight pairs of abdominal prolegs (Fig. 153); extremely variable in appearance, ranging from cryptically coloured and brightly coloured, caterpillar-like types (sometimes armed with distinct spines or coated with waxen powder), to slug-like, slime-covered forms; entirely phytophagous, solitary or gregarious; usually free-living but some species are gall-inhabiting, leaf-mining or stem-boring.
EXAMPLES: Blennocampinae - Athalia rosae (turnip sawfly), Blennocampa pusilla (leaf-rolling rose sawfly), Caliroa cerasi (pear slug sawfly); Nematinae - Cladius difformis and C. pectinicornis (antler sawflies), Croesus septentrionalis (hazel sawfly), Hoplocampa testudinea (apple sawfly), Nematus ribesii (common gooseberry sawfly); Selandriinae -Dolerus spp. (pests of cereals and grasses).
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