Order Hemiptera: suborder Sternorrhyncha

Recognition of Sternorrhyncha

The Sternorrhyncha are distinguished from other hemipteran by the following combination of characters:

• Mouthparts arising from the back of the head capsule, no sclerotized gula separating the base of the labium from the hind margin of the head capsule [shared with Archeorrhyncha and Clypeorrhyncha; gula present in Prosorrhyncha]; base of labium at least in part between the fore-coxa [anterior to the coxae in Archeorrhyncha and Clypeorhyncha; at front of head in Prosorrhyncha] (mouthparts missing in male scale insects and in sexual forms of the aphid families Pemphigidae and Hormaphididae).
• Tarsi with 1 or 2 articles (rarely absent) [3 in Archeorrhyncha and Clypeorhyncha, 2 or 3 in Prosorrhyncha].
• Antennal flagellum not markedly thin and bristle-like (but distal article of Aphidoidea with a slender extension, sometimes quite long).

Aphids of British Columbia: last update 1998-09-28
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