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 : 405

Sitona cylindricollis Fåhraeus, 1840

( FIgS 2–8c )

Body. LeNgTH 4.0–4.8 MM, WIDTH 1.2–1.5 MM. SeTAe VeRY lONg TO VeRY SHORT. PROTHORAX ( FIg. 2c ) WITH 8 prns, ONe SeTA PlAceD clOSe TO SPIRAcle. MeSO- AND MeTATHORAX ( FIg. 2c ) eAcH WITH 1 MeDIUM lONg prs AND 4 VeRY lONg pds. EAcH PeDAl AReA WITH 5 pda, DIFFeReNT IN leNgTH. AbD. VIII ( FIg. 4c ) WITH 1 SHORT prs AND 3 pds, ts POORlY DeVelOPeD.

Head. YellOWISH, lATeRAllY FlATTeNeD; WIDTH: 0.60 –0.80 MM, leNgTH: 0.60–0.80 MM; eNDOcARINA ReAcHeS 1/3 THe leNgTH OF FRONS. Des 4 SHOWINg HAlF THe leNgTH THAN THe ReMAININg des ( FIg. 5c ). Fs 1 AND fs 3 SHORT, fs 4 AS lONg AS fs 5. Les 1 AND les 2 eQUAl IN leNgTH, SlIgHTlY SHORTeR THAN des 1 . Ves 1-2 SHORT, POORlY DeVelOPeD. POSTePIcRANIAl AReA WITH 4 pes . STeMMATA PReSeNT. ANTeNNAl bASAl MeMbRANOUS ARTIcle WITH 5 bASIcONIc SeNSIllAe. LAbRUM ( FIg. 6c ) APPROXIMATelY 2.0 TIMeS AS WIDe AS lONg; ANTeRIOR MARgIN SlIgHTlY SINUOUSlY eMARgINATeD, 2 PAIRS OF ams AND 2 PAIRS OF als . LAbRAl RODS SlIgHTlY cONVeRgINg POSTeRIORlY. ClYPeUS ( FIg. 6c ) 3.5 TIMeS AS WIDe AS lONg, ANTeRIOR AND lATeRAl MARgINS STRAIgHT; MeDIAN FURROW ReAcHeS 2/3 THe leNgTH OF clYPeUS. EPIPHARYNX ( FIg. 7c ) WITH 2 PAIRS OF als ; 2 PAIRS OF ams AND 2 PAIRS OF mes. MANDIble: SecOND TOOTH cONIcAl, PlAceD, clOSe TO APeX. MAXIllA ( FIg. 8c ) WITHOUT mbs; bASAl PAlPOMeRe WIDeR, AlMOST ReAcHINg HAlF THe leNgTH OF THe DISTAl. PRAelAbIUM cORDIFORM, WITH A SINgle PAIR OF ligs; bASAl PAlPOMeRe SlIgHTlY WIDeR THAN THe DISTAl; pslb 3 DISTINcTlY SHORTeR THAN THe ReMAININg SeTAe.

Figures

FIGURES 5 (a – h). 5 — Mature larva, head. a—Andrion regensteinense, b—Charagmus gressorius, c— Sitona cylindricollis, d—S. hispidulus, e—S. lineatus, f—S. macularius, g—S. obsoletus, h—S. waterhousei. Setae: des — dorsoepicranial, fs — frontal, les — lateroepicranial, pes — postepicranial, ves — ventral.

FIGURES 6 (a – h). 6 — Larval mouthparts, labrum and clypeus. a—Andrion regensteinense, b—Charagmus gressorius, c— Sitona cylindricollis, d—S. hispidulus, e—S. lineatus, f—S. macularius, g—S. obsoletus, h—S. waterhousei. Setae: cls— clypeal, lrs— labral, clss — clypeal sensorium.

FIGURES 7 (a – h). 7 — Larval mouthparts, epipharynx. a—Andrion regensteinense, b—Charagmus gressorius, c— Sitona cylindricollis, d—S. hispidulus, e—S. lineatus, f—S. macularius, g—S. obsoletus, h—S. waterhousei. Setae: als— anterolateral, ams— anteromedial, mes— median.

FIGURES 8 (a – h). 8 — Larval mouthparts, maxillolabial complex, ventral aspect. a—Andrion regensteinense, b—Charagmus gressorius, c— Sitona cylindricollis, d—S. hispidulus, e—S. lineatus, f—S. macularius, g—S. obsoletus, h—S. waterhousei. Setae: dms— dorsomalar, ligs— ligular, mxps— maxillary palp, mbs— malar basiventral, pfs— palpiferal, plbs— prelabial, pslbspostlabial, stps— stipal, vms— ventromalar.

FIGURES 2 – 4 (a – d). 2 — Mature larva, chaetotaxy of thoracic segments, 3 — chaetotaxy of first abdominal segment, 4 — chaetotaxy of the 7 th — 10 th abdominal segments. a—Andrion regensteinense, b—Charagmus gressorius, c— Sitona cylindricollis, d—S. hispidulus. Setae: as — alar, ds — dorsal, eps — epipleural, eus — eusternal, lsts — laterosternal, pda — pedal, pds — postdorsal, prns — pronotal, prs — prodorsal, ps — pleural, sps — spiracular, sts — sternal, ts— terminal.