cercus


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cercus

[′sər·kəs]
(invertebrate zoology)
Either of a pair of segmented sensory appendages on the last abdominal segment of many insects and certain other anthropods. Also known as cercopod.
References in periodicals archive ?
Male sixth through eighth abdominal segments completely retractable within the anterior part of the abdomen, gonocoxite and gonostylus of male terminalia extremely prolonged and thin; ovipositor elongated and protractible, cercus with simple setae.
Epiproct triangular with deep transverse furrow and rounded apex; valves of ovipositor long, straight, with slightly curved apices; cercus in both sexes straight, conical, usually shorter than the paraproct in female and slightly exceeding paraproct in the male; male subgenital plate conical.
from its congeners: palpi 4-segmented; male cerci bilobed, with outer lobe longer than inner; male hypoproct short, as long as inner cercus lobe; aedeagus 1.5 times longer than hypoproct; apex of aedeagus with irregular edge; and inducing galls on M.
2 Mesonotum mostly bare of microtomentum, shiny and with bicoloured pattern of dark brown and yellowish orange; cercus of [male] bearing 5 stout, tooth-like setae
As a second diagnostic character he described and figured the shape of the male cercus. Both characters were already mentioned by Uvarov, who had sent the specimens to Ramme (Ramme 1939, p.
Male terminalia (Figure 10): gonocoxite with mesal lobe; gonostylus and gonocoxite subequal in length, gonostylus elongate, 0.15-0.16 mm long and 0.02 mm wide (n=3), striate except near basis, setulose basally; cercus setose and secondarily lobed; hypoproct narrow, conspicuously longer than cercus, deeply bilobed, and setose; aedeagus and hypoproct subequal in length, aedeagus 0.14-0.15 mm long (n=3), triangular, constricted near apex and rounded apically.
Surstylus with upper blade of bifurcated tip swollen and lower one shorter; cercus with ventral appendix, which is directed posterior (Figs.
Cercus heavily sclerotised, somewhat arched dorsally; bearing several spine-like setae.