cornicle

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cornicle

[′kȯr·nə·kəl]
(invertebrate zoology)
Either of two protruding horn-shaped dorsal tubes in aphids which secrete a waxy fluid.
References in periodicals archive ?
Apterae are rather elongate oval, pale green or yellow, typically with black or dark green longitudinal pleural stripes that may be segmentally divided, and dark siphunculi.
elegans are easily identifiable by observing the siphunculi, which have a dark swollen extremity and a pale cylindrical base, and their wings, which have dark triangular spots at the ends of all the veins.
Color in life dull pale green, with yellowish appendages and siphunculi.
Anal plate and cauda pale brown, paler than siphunculi.
0 mm) (Blackman & Eastop 1994) with troncoconic siphunculi and setae (Fig.
5 times longer, (4) siphunculi conspicuous (in exceptional cases, lacking or very small), (5) head and prothorax well separated; (6) compound eyes large with numerous ommatidia, (7) secondary sensoria rounded or ovoid, etc.
The siphunculi are cylindrical, with the apical ridge well developed, pale on approximately the apical 2/3 of their length (Fig.
1) are dark brown with long yellowish-brown siphunculi, apically curved outwards.
podocarpini because: (1) intersegmental sclerites are clearly visible; (2) siphunculi relatively prominent with wide basal diameter; (3) setae usually absent from dorsum of caudal knob; and (4) first tarsal segments without dorsal setae in alatae.
Siphunculi almost as dark as head, with one proximal part tapering, 0.
Very similar to apterous ones, but with pterothorax brown, more pigmented head, antennae, prothorax, part of femora and tibiae, tarsi, siphunculi and cauda, and stigmatic and marginal sclerites tenuously pigmented.