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Family Argidae - Argid Sawflies

sawfly - Arge coccinea Who has split antennae like this? - Zynzus magnus - male Unknown Sawfly - Arge pectoralis - female Black and Orange Sawfly - Atomacera decepta Birch Sawfly Larva (Arge pectoralis) - Arge pectoralis sawfly ovipositing on pin cherry - female IMG_0020 Argidae ?
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Symphyta" - Sawflies, Horntails, and Wood Wasps)
Family Argidae (Argid Sawflies)
Synonyms and other taxonomic changes
revised in(1)
Numbers
~60 spp. in 12 genera in our area(2)
Size
8-15 mm(2)
Identification
Stout bodied, easily recognized by their characteristic antennae: three-segmented, the third segment very long; males of some species have the last antennal segment U-shaped or Y-shaped. Most argids are black or dark colored.
NA argid larvae may be separated from other sawfly larvae by the following combination of characters: (1) Presence of a divergent lobe next to the tarsal claw of each thoracic leg (lobe reduced in Atomacera); (2) one-segmented antenna which may be flat, rounded, or peglike; (3) abdominal segments 1 to 9 each with 3, sometimes 2, annulets; (4) presence of a tarsal claw on each thoracic leg, or only prothoracic leg lacking a tarsal claw.(3)
Key to genera in(1)
Range
Worldwide, most diverse in the tropics.
Food
The larvae feed mainly on foliage of various kinds of ferns, horsetails, gymnosperms and angiosperms, occasionally they feed on the pith of twigs or on catkins.
Print References
descriptions & host associations of several common eastern species(4)
Internet References