What does cornicle mean?
A cornicle is one of a pair of small, tube-shaped structures that project from the back of an aphid's abdomen. These organs are unique to aphids among common insects and serve primarily in defense and communication. When an aphid is threatened by a predator such as a ladybird, it can release droplets of a waxy fluid from its cornicles; this secretion can entangle or repel attackers, and it also contains alarm pheromones that prompt neighbouring aphids to flee or drop off the plant. The size, shape, and length of the cornicles vary between species, so entomologists often rely on them as diagnostic features when identifying aphids. Because the term belongs largely to specialist vocabulary, it appears mainly in entomological literature, field guides, and pest-management texts rather than everyday speech. Knowing it offers a vivid glimpse into the sophisticated chemical defences of one of agriculture's most familiar pests.
nounA pair of small tube-like structures projecting from the rear of an aphid's abdomen, through which the insect secretes defensive fluids such as a waxy alarm pheromone. Also called siphunculi.
- Either of the pair of small tubes on the hind end of an aphid's abdomen that discharge defensive or signalling secretions.
"When threatened, the aphid released a waxy secretion from its cornicles to warn nearby colony members."
"Under magnification, the paired cornicles were clearly visible at the tip of the aphid's abdomen."
"Entomologists use the shape and length of the cornicles as one of the features for identifying aphid species."
Standard plural; typically used in scientific descriptions since the structures appear in pairs.
"The species was identified partly by the unusually long dark-tipped cornicles."
Aphids carry their own built-in smoke signals: tiny tailpipes called cornicles that puff out a chemical warning when danger strikes.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cornicle
The word cornicle derives from the Latin diminutive corniculum, meaning 'little horn', itself formed from cornu, 'horn'. It entered English usage in scientific writing, reflecting the horn-like appearance of the paired tubes on the aphid's abdomen. The same Latin root cornu gives English a family of related words including cornea, unicorn, cornet, and cornucopia.
How cornicle is actually used
A technical term used almost exclusively in entomology and biology; unfamiliar to most general readers. The plural is standard in scientific writing since the structures occur in pairs.
Easily confused with cornicle
A cannula is a thin medical tube inserted into the body, whereas a cornicle is a natural anatomical structure on an aphid.
A chronicle is a historical record of events; despite the similar spelling, it has no relation to the aphid organ.