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The cornicle (or siphuncule) is one of a pair of small upright backward-pointing tubes found on the dorsal side of the 5th or 6th abdominal segments of...

are relatively long, and the cauda (tail-like protrusion) is pale. The siphunculi (pair of small backward-pointing tubes on the abdomen) are long, tapered...

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 related...

rudbeckiae are shiny, bright red with yellowish legs and black antennae. The siphunculi are less than 1.6 times as long as the cauda, with reticulation of small...

the abdomen is a pair of slender, elongated tubes known as cornicles or siphunculi. Their function is the production of a defensive waxy secretion. They...

times of year in many species. Most aphids have a pair of cornicles (siphunculi), abdominal tubes on the dorsal surface of their fifth abdominal segment...

and along the sides of the body are two smaller black cone structures (siphunculi). Tuberolachnus salignus reproduces solely through parthenogenesis so...

brown, and it usually has a body length of 1.7-2.2 mm. It has long, hairy siphunculi (at least one-third of body length) dark brown curved outwards distally...

longer than in other aphids, pale green but darker at the apices. The siphunculi are pale coloured, cylindrical with dark tips and operculi, and are about...

apices of the femora, tibia and tarsi are black. The cylindrical black siphunculi are wide at the base and one fifth of the body length. The winged female...

between the siphunculi. The whole insect is clad in fine short hairs. The alate (winged) female has a blackish thorax, prominent black siphunculi and membranous...

these aphids are about 2 mm (0.08 in) long, with short antennae and short siphunculi, greenish-grey and dusted with wax particles. On the secondary host, wingless...

faces of the antennal tubercles in dorsal view, and the slightly clavate siphunculi which are dark-tipped and approximately as long as the terminal process...

body are large crescent-shaped black sclerites which are in front of the siphunculi. The eyes are red in colour. Dependent on the stage in their lifecycle...

rostral length of segment IV and segment V are 0.98 mm. One pair of conical siphunculi are present on the apex abdomen. The hind femur is 0.12 mm long and the...

glossy yellowish-green with a darker dorsal stripe. The antennae, legs and siphunculi (erect, backward-pointing tubes on the abdomen) are relatively long and...

slight waxy covering, and grow to a length of about 2 mm (0.1 in). The siphunculi (slender tubes on the fifth abdominal segment) are cylindrical, pale and...