Sitona cylindricollis Fåhraeus, 1840

Sprick, Peter, 2017, Description of the larvae and pupae of eight species of the tribe Sitonini Gistel, 1848 (Coleoptera, Curculionidae) from Central Europe, Zootaxa 4324 (3), pp. 401-435 : 416

Sitona cylindricollis Fåhraeus, 1840

( FIgS 27–29c )

Body. LeNgTH: 3.6–4.2 MM, MAXIMUM WIDTH (AT THe leVel OF PROcOXAe): 2.4–2.7 MM, HeAD WIDTH (AT THe leVel OF eYeS): 0.8–0.9 MM, PROTHORAX WIDTH (AT WIDeST PlAce): 1.1–1.2 MM (♀, ♂). EYeS HeMISPHeRIcAl. BODY MODeRATelY elONgATe, WHITe OR gRAYISH. PRONOTUM SlIgHTlY ROUNDeD, APPROXIMATelY 1.6 TIMeS AS WIDe AS lONg. MeTANOTUM A lITTle lONgeR THAN MeSONOTUM. AbD. I–III OF AlMOST eQUAl leNgTH, AbD. VI–VI gRADUAllY DIMINISHeD, AbD. VII SeMIcIRcUlAR, AbD . VIII NARROW, AbD. IX DISTINcTlY SMAlleR THAN THe PReceDINg SegMeNTS, ReDUceD. UROgOMPHI RelATIVelY elONgATe, cURVeD AND Well ScleROTIZeD.

Chaetotaxy. SeTAe OF HeAD OF UNeQUAl leNgTH AND SHAPe, bROWN, HAIR-FORM OR THORN-lIke, bASeD ON PROTUbeRANceS. ROSTRUM WITH A PAIR OF rs; HeAD cAPSUle beARINg 1 vs, 2 VeRY SHORT, WeAklY DeVelOPeD sos 1-2, 2 os 1-2 AND 2 pas 1-2 ( FIgS 27c, 29c ). PRONOTUM WITH 2 as 1-2, 2 ds 1-2, ls, 2 sls 1-2 AND 2 pls 1-2 ( FIgS 28c, 29c ). All SeTAe OF PROTHORAX PlAceD ON SMAll PROTUbeRANceS, MODeRATelY elONgATe, eQUAl IN leNgTH. CHAeTOTAXY OF MeSOTHORAX AND MeTATHORAX VeRY SIMIlAR, eAcH OF THeM cONSISTINg OF 3 PAIRS OF RelATIVelY lONg d 1-3, PlAceD ceNTRAllY ( FIg. 28c ). TeRgAl PARTS OF AbD. I–VII eAcH WITH 7 PAIRS OF SeTAe, DIFFeReNT IN SIZe, THORN-lIke, WHIcH FORM A RegUlAR TRANSVeRSe ROW AlONg THe POSTeRIOR MARgIN. SeTAe NO. 1, 3, 5 AND 6 Well VISIble, PlAceD ON DISTINcT PROTUbeRANceS; SeTAe NO. 2, 4 AND 7 VeRY SHORT, WeAklY VISIble, SO AT FIRST VIeW cHAeTOTAXY OF eAcH SegMeNT SeeMS TO cONSISTS OF 4 PAIRS OF SeTAe. AbD. VIII WITH ONe PAIR OF THORN-lIke, Well VISIble SeTAe lATeRAllY AND A PAIR OF SHORT, WeAklY VISIble SeTAe ceNTRAllY ( FIgS 28c, 29c ). EAcH AbD. I–VIII WITH A PAIR OF SHORT l 1-2, PlAceD clOSe TO THe bORDeR OF THe TeRgUM ( FIg. 29c ). STeRNAl PARTS OF eAcH AbD. VII–VIII WITH 3 PAIRS OF MIcROSeTAe v 1-3 (VeNTRAl S.), lOcATeD POSTeRIORlY ( FIgS 27c, 29c ). AbD. IX WITH 2 SHORT SeTAe PlAceD DORSAllY, clOSe TO UROgOMPHI ( FIgS 27c, 29c ). EAcH UROgOMPHUS beARS A PAIR OF SHORT SeTAe.

Figures

FIGURES 27 – 29 (a). Andrion regensteinense, pupa, habitus and chaetotaxy. 27 a—total (ventral view), 28 a—total (dorsal view), 29 a—total (lateral view) (ur—urogomphi, setae: as— apical, d— dorsal, ds— discal, fes— femoral, ls, l — lateral, mts — mandibular theca, os— orbital, pas— postantennal, pls— posterolateral, rs — rostral, sos— superorbital, sls— superlateral, vventral, vs— vertical).