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 ?
Epandrium with strong setae at middle; surstylus with upper blade of bifurcated tip extremely swollen and lower one slightly sharp at tip; cercus arched with short sparse setae, without ventral appendix.
xuae Wang, Yang basal ventral bristles; cercus round & Grootaert, 2005 17'.
Mesonotum invested with microtomentum, appearing somewhat dull, mostly unicolourous; cercus of [male] bearing several long setulae, especially posteriorly, but
Cercus heavily sclerotised, cone-shaped, with numerous long setae along anterior margin.
Cercus long, apically nearly acute; dark brown with sparse setulae.
13 Mid femur with row of regular, long black setulae posteroventrally, but without long erect ventral setulae longer than tibial diameter; doubtful species have conspicuous laterally widened cercus .
Wing with 6 or 8 large white spots; clasping cercus narrow, finger-like
Diagnosis: The conspicuous black margin on the dorsal inner surface of the cercus and the long tooth with two pairs of black spines (Figs 219, 220) distinguish S.
General morphology of ovipositor and membranous valves similar to those of Ellipteroides (Protogonomyia) adrastea Stary & Mendl, 1984, from which it differs by female cercus longer than tergite 10, distally thinner and upturned, and with blunt tip.
Female terminalia: Segment 7 longer than 6, ventrally-directed downward; sternite 7 trapezoidal; sternite 8 brownish-yellow, subdivided; hypoproct shiny orange, with 2 small fine setulae; cercus dark brown, long setulose; 3 brown sclerotised spherical spermathecae present.
Female terminalia: Cercus with elongate-ovale shape, two--segmented, segment 1 much larger than segment 2.
40, ep) slightly broader dorsally than ventrally (viewed laterally), evenly-rounded on dorsal margin, posterior margin slightly angled, ventral margin with extensive row of long, regular to irregular, apically-directed setae; cercus (Fig.