The cornicle (or siphuncule) is one of a pair of small upright backward-pointing tubes found on the dorsal side of the last segment of the bodies of aphids. They are sometimes mistaken for cerci. They are no more than pores in some species. These abdominal tubes exude droplets of a quick-hardening defensive fluid containing triacylglycerols called...
Tubelike structure located dorsally on abdomen
• (n.) A little horn.
One of the pair of small tubular outgrowths on the hind end of the aphid abdomen.
Cor'ni·cle noun [ Latin corniculum , dim. of cornu horn.] A little horn. [ Obsolete] Sir T. Browne. 
Dorsal tubular processes on the posterior portion of the abdomen; common on aphids.
One of the pair of small tubular outgrowths on the hind end of the aphid abdomen.
tubular projections from the abdomen of an aphid.
short, tubelike projection at the back of aphid abdomens used for secreting defensive chemicals
any of various small, horn-shaped processes, esp. one of a pair of tubes at the posterior end of the abdomen of aphids, from which a waxy fluid is emitted.