calypter

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Related to Calypters: haltere

calypter

[kə′lip·tər]
(invertebrate zoology)
A scalelike or lobelike structure above the haltere of certain two-winged flies. Also known as alula; squama.
References in periodicals archive ?
n., sharing with it the following combination of characteristics: head with yellow or yellowish-grey pruinosity, occiput with pale cream-coloured hairs, three postsutural supra-alar setae, and yellow calypters. Proparachaeta paraguayensis differs from P.
Head yellow pruinose or silvery grey when viewed from certain angles; ocellar setae weak almost not differentiated from ocellar triangle setulae; scutellar dorsum brown with brown pruinosity; calypters yellow with light brown pruinosity; abdomen dark brown in ground colour (or dark brown with sides reddish-brown in one specimen) with tergites 3 and 4 each with irregular band of grey pruinosity on anterior fifth and faint light brown pruinosity posteriorly in posterodorsal view; tergite 5 with yellow pruinosity, denser ventrally; syntergite 1+2, tergites 3 and 4 each with a spot of dense grey pruinosity on midventral margin in posteroventral view.
Head yellow pruinose; four postsutural supra-alar setae; ratio of the posteriormost acrostichal, dorsocentral and intra-alar setae length and their respectively preceding setae relatively shorter compared to the other species; calypters yellow with light yellow pruinosity; abdomen dark brown in ground colour except laterally lighter; tergite 3 in posterodorsal view with irregular band of grey pruinosity on anterior fifth and faint brown pruinose posteriorly; tergite 4 with irregular band of yellowish-grey pruinosity on anterior fifth and brown pruinose posteriorly; tergite 5 yellow pruinose.
Calypteres with dark edge; lower calypter with lobular internal margin, not directed towards the scutellum.
Wing: Base black, basicosta grey-brown; costa setulose only basally on ventral surface, anterior surface with row of pectinate short spines, longest one equal to length of crossvein r-m; costal spine longer than crossvein r-m, radical node bare, calypters yellowish, lower about half length of upper one; halter brown-yellow.
15 Anterior katepisternal seta absent; lower calypter broad and truncated, of the Musca type (see couplet 6 for description); vein [R.sub.4+5] without dorsal setulae; 1 species ...
--Anterior katepisternal seta present; lower calypter not broad and truncated, tongues-haped, of the Phaonia-type (see couplet 6 for description); [R.sub.4+5] with a few dorsal setulae basally [other characters: veins Sc, Rs andM setulose, usually as follows: vein R before humeral cross-vein, on both surfaces; basal part of Sc, on both surfaces; ventral surface of [R.sub.4+5] almost to cross-vein r-m; both surfaces of M to beyond cross-vein dm-cu; ventral surface of Cu]; 1 species ...
Diagnosis: General colouration dark greyish, with yellowish tinge; head 1.25* as wide as high; arista plumose only on dorsal surface; palpus spatulate, slightly narrowed in basal 1/4 to 1/2 reaching tip of haustellum when proboscis flexed; presternum setulose; proepisternal depression and postalar wall bare; prealar seta differentiated or vestigial; lower calypter ca 2x as long as upper calypter.