clavus


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Related to clavus: clavus hystericus

clavus

[′klāv·əs]
(invertebrate zoology)
Any of several rounded or fingerlike processes, such as the club of an insect antenna or the pointed anal portion of the hemelytron in hemipteran insects.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Uncus slender and long, sharp apically; tegumen relatively narrow; valva intermediate in size; cucullus arched; harpe slender and curved distally, shorter than uncus, sharp apically and bifurcate basally; sacculus intermediate in size, left processus blunt, right processus pointed; clavus triangular; saccus relatively broad (Fig.
2A, D); scutellum flattened; pronotum and scutellum impunctate; posterior part of metepimeron roundish, not angulate; metasternum without medial outgrowth; R + M vein almost reaching apex of corium; inner margin of clavus longer than scutellum (Fig.
Forewing with apex of clavus sanguineous with a large bluish-black spot; base of first apical cell sanguineous (Kirkaldy, 1906) D.
Hemelytra: Mostly testaceous, with endocorium weakly enbrowned and bases of setae of exocorium dark brown, and with patterned red highlighting: on inner margins of clavus and anterior half of claval commissure, half length of exocorium, red star-shaped marking distally on corium.
Male forewing: Mostly orangish brown, sometimes with base of clavus darker brown; apex of corium at fracture with white fasciae; cuneus and membrane orangish brown.
Forewings 2.22 times longer than wide, with sparse setae on surface, tubercles along veins, claval veins without tubercles; 2 indistinct subapical lines of cross veins; fork Sc+RP distad of fork CuA1+CuA2; r-m crossvein slightly distad of fork MA+MP; RP apically bifid, MA apically bifid, MP apically bifid; fork PCu+A1 slightly basad of centre of clavus; Sc+R and M fused at superior-outside angle of basal cell; fork MA1+MA2 distad of fork MP1+MP 2.
Hemelytra hyaline, somewhat tinged with maroon; apex of clavus dark brown; apex of embolium and apical 1/3 of cuneus infuscate; membrane pale grayish brown, semitransparent, with slightly brownish veins.
Body length 3.75 [+ or -] 0.09; head length 0.41 [+ or -] 0.06; width across eyes 0.68 [+ or -] 0.02; interocular distance 0.39 [+ or -] 0.03; antennal segments: I 0.28 [+ or -] 0.03, II 0.44 [+ or -] 0.03, III 0.34 [+ or -] 0.03, IV 0.48 [+ or -] 0.04; rostral segments: I 0.43 [+ or -] 0.03, II 0.41 [+ or -] 0.02, III 0.38 [+ or -] 0.03, IV 0.29 [+ or -] 0.02; pronotum: length 0.74 [+ or -] 0.05, width across anterior margin 0.62 [+ or -] 0.04, width across humeral angles 1.3 [+ or -] 0.04; scutellum: length 0.45 [+ or -] 0.04, width 0.7 [+ or -] 0.02; length claval comissure 0.38 [+ or -] 0.04; width across apex of clavus 1.63 [+ or -] 0.05; length hemelytra 2.73 [+ or -] 0.06; length membrane 1.29 [+ or -] 0.03.
1G) rounded apically, about 2.5-2.7 times longer than maximum width, widest at level of nodal line; corium without granulation; costal cell with 13-15 oblique transverse veinlets; Sc + R forked at basal fourth; Cu bifurcated at nearly basal 1/3; claval apex beyond midpoint of tegmen, claval veins uniting at slightly basal 3/5 of clavus; nodal line and subapical line distinct, forming numerous subapical and apical cells, the number of subapical and apical cells variable.
Forewings color lighter than body, veins same to body, with a small brown mark along cross vein near apex of clavus. Ocelli, eyes dark brown.
Hemelytron generally fuscous, outer margin of clavus, embolium, and base and apex of cuneus sometimes more or less pale; membrane dark smoky brown, with whitish veins.
Hemelytra: Corium and clavus completely brown or brown with a partial to complete golden fascia on anterior half of wing.