- 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...
- 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...
- 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...
-
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...
-
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...
-
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...
-
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...
