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[R] Paired dorsal tubes on the abdomen of aphids and characteristic of this family; absent in certain genera (e.g. Eriosoma). The waxy secretions they produce act as alarm pheromones or serve as covering materials.
Also called "honey tubes" or cornicles.

[R] Images

* Aphids (Aphidoidea) (INRA)
1: apterous parthenogenetic female; winged parthenogenetic female.
a: cauda; b: siphunculus; c: antennal tubercle; d: antenna; e: spiracles.
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HYPPZ on line: Species (scientific names), Pests (common names), Glossary, Crops.

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