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. Alatae have dark brown dorsal abdominal cross-bands and separate marginal sclerites.
Body length (from head to base of siphunculi) Body width (measured between siphunculi) Head width (from left to right margins of ocular tubercles) Coxa width (body width from left to right outer margins of fore coxae) Head length (from central margin between antennae to notch between fore coxae)
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.
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. Body 1.65-2.45 mm including cauda.
Distinguishing characters of the Lachninae include: (1) anal plate whole, (2) cauda broadly rounded or arc-shaped, (3) processus terminalis of antennal segment VI noticeably shorter than base of this segment, (4) ultimate rostral segment with 2 clearly differentiated portions, (5) head bearing an epicranial suture is well separated from prothorax, (6) empodial setae short and fine, (7) secondary sensoria subcircular or slightly ovoid, (8) antennae usually shorter than body (slightly longer than the body in some species), and (9) siphunculi troncoconic, short and robust (more or less volcano-like) with associated setae, or small at distal ring (poriform).
The classical separation of the subgenera Uroleucon, Uromelan and Lambersius is based on the pigmentation of the siphunculi and cauda (considered separately and compared), and secondly on the color of the body when alive and the dorsal sclerites of the abdomen; also, Lambersius is restricted to America, except for certain anthropic introductions.
The apterous viviparous females are small (1.2-1.6 mm) and are characterized by their natural dark coloration, white capitate setae, dark cauda, and the bicolored siphunculi (Figs.
The genus Greenidea comprises about 45 East Asian species of pear-shaped aphids with 6-segmented antennae, long hairy and pale reticulated siphunculi, rounded cauda with a median processus and 7.7.7 setae on first tarsal segments (Sugimoto 2008).
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." (Heie 1994).
(C.) 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. It is an unnamed species of Uroleucon and is described below.