ⓘ Cornicle. The cornicle is one of a pair of small upright backward-pointing tubes found on the dorsal side of the 5th or 6th abdominal segments of aphids. They a ..

                                     

ⓘ Cornicle

The cornicle is one of a pair of small upright backward-pointing tubes found on the dorsal side of the 5th or 6th abdominal segments 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 cornicle wax. There is some confusion in the literature about the function of the cornicle wax secretions. It was common at one time to suggest that the cornicles were the source of the honeydew, and this was even included in the Shorter Oxford English Dictionary and even appears in the 2008 edition of the World Book Encyclopedia. There also is documentation in the literature for cornicle wax luring predators in some cases.

                                     
  • have a pair of little tubes, called cornicles projecting dorsally from the posterior of their abdomens. The cornicles have been variously interpreted in
  • abdomen. The antennae are dark, the legs are pale with dark joints and the cornicles are pale with dark tips. The body is faintly dusted with a white powder
  • about 2.2 mm 0.09 in The cauda tail - like elongation of the body and cornicles are black and the antennae and legs are pale with brown tips. Winged females
  • Araucariaceae that survived extinctions in the late Cretaceous. Organs like the cornicles did not appear until the Cretaceous period. One study alternatively suggests
  • invasive species. Unlike aphids, the adelgids have no tail - like cauda and no cornicles Adelgids only lay eggs, and never give birth to live nymphs as aphids
  • two rows of angular pylons faced with light gray marble. Large metal cornicles running along the base of the ceiling hide the illumination lamps. The
  • terminal filament and is not regarded as a cercus. Aphids have tube - like cornicles or siphunculi that are sometimes mistaken for cerci but are not morphologically
  • bluntly rounded, the legs are pale except for the extremities, and the cornicles are pale - coloured, short and flanged. Winged females range from 1.3 to
  • rows of shining black spots and specks of wax in transverse rows. The cornicles upright tubes found on the last abdominal segment are prominent and