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 ?
The cauda (extension of the eighth abdominal segment) is sharp and siphunculi on the dorsal or lateral surface of sixth abdominal segment are black towards the apex, much longer that the cauda.
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.
rufomaculata based on type specimens indicating that in the live specimens the body is generally green, vertex of the head dusky, eyes light red, abdomen green and siphunculi dusky.
Color in life dull pale green, with yellowish appendages and siphunculi.
0 mm) (Blackman & Eastop 1994) with troncoconic siphunculi and setae (Fig.
6 mm) and are characterized by their natural dark coloration, white capitate setae, dark cauda, and the bicolored siphunculi (Figs.
The alatae viviparous females are more long-bodied and have longer siphunculi than the apterous ones.
Morphologically, the genus Aulacorthum is well characterized by "head with well developed antennal tubercles, inner sides of tubercles nearly parallel; median tubercle on frons hardly developed; head usually granulate in apterous; first tarsal chaetotaxy 3:3:3; siphunculi cylindrical, or slightly swollen, normally broad at base, rather long with usually a few row of flat hexagonal cells at apex under broad distal flange; cauda tongue-shaped with 4-8 setae, mostly 7 setae.
cuschensis because (1) membranous distal part of the caudal knob in apterous viviparous females is small, contrasting very little with the rest of the knob; (2) the dorsum of head, antennae, legs, and siphunculi are very weakly pigmented in apterous viviparous females; (3) setiferous sclerites are absent from dorsum of abdomen in apterous viviparous females; and (4) they are green when alive.
Ortego) collected a sample of aphids belonging to tribe Macrosiphini (Aphididae) and to the group of Macrosiphum Passerini, 1860, and related genera, which is characterized by the reticulated ornamentation on the distal part of siphunculi.