Corniculi

Also known as siphuncule

thumb|right|200px|Aphid excreting defensive fluid from the cornicles thumb|Cornicles The cornicle (or siphuncule) is one of a pair of small upright backward-pointing tubes found on the dorsal side of the fifth or sixth abdominal segments of aphids. They are sometimes mistaken for cerci. They are no more than pores in some species.