Sitona waterhousei Walton, 1846

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 : 415

Sitona waterhousei Walton, 1846

( FIgS 2–8H )

Body. LeNgTH 3.6–4.2 MM, WIDTH 1.2–1.5 MM. SeTAe VeRY lONg TO VeRY SHORT. PROTHORAX ( FIg. 2H ) WITH 7 prns. MeSO- AND MeTATHORAX ( FIg. 2H ) eAcH WITH 1 MeDIUM lONg prs AND 4 pds: FIRST lONg, SecOND SHORT, NeXT TWO lONg; eps MeDIUM lONg. EAcH PeDAl AReA WITH 6 pda, DIFFeReNT IN leNgTH. AbD. VIII ( FIg. 4H ) WITH 1 SHORT prs AND 4 pds; ts VeRY SHORT. AbD. X WITH 2 MINUTe ts.

Head. BROWN, WIDe, WITH PARAllel SIDeS; WIDTH: 0.70–0.85 MM, leNgTH: 0.60–0.70 MM; eNDOcARINA ReAcHeS 2/3 THe leNgTH OF FRONS ( FIg 5H ). Fs 1 AND fs 3 VeRY SHORT, fs 4 SlIgHTlY SHORTeR THAN fs 5. Les 1 AND les 2 eQUAl IN leNgTH, AS lONg AS des 1. Ves 1-2 SHORT, POORlY DeVelOPeD. POSTePIcRANIAl AReA WITH 4 pes. STeMMATA DeVelOPeD. ANTeNNAl bASAl MeMbRANOUS ARTIcle WITH 5 bASIcONIc SeNSIllAe. LAbRUM ( FIg. 6H ) APPROXIMATelY 3.8 TIMeS AS WIDe AS lONg; ANTeRIOR MARgIN SINUOUSlY eMARgINATeD; A PAIR OF ams, 2 PAIRS OF mes, VARIOUS IN leNgTH , AND 3 PAIRS OF als. LAbRAl RODS cONVeRgINg POSTeRIORlY. ClYPeUS ( FIg. 6H ) 3.5 TIMeS AS WIDe AS lONg; ANTeRIOR MARgIN AlMOST STRAIgHT, lATeRAl MARgINS DISTINcTlY SINUOUSlY eMARgINATeD; MeDIAN FURROW ReAcHeS 3/4 THe leNgTH OF clYPeUS. EPIPHARYNX ( FIg. 7H ) WITH 3 PAIRS OF als; A PAIR OF ams AND 2 PAIRS OF mes. MANDIble WITH 2 ADDITIONAl TeeTH, PROXIMAl SHARP, NeXT blUNT, bOTH clOSe TO APeX. MAXIllA ( FIg. 8H ) WITHOUT mbs; bOTH PAlPOMeReS eQUAl IN leNgTH, bUT bASAl PAlPOMeRe DISTINcTlY WIDeR THAN THe DISTAl. PRAelAbIUM TRIANgUlAR , WITH 2 PAIRS OF ligs; bASAl PAlPOMeRe SHORTeR AND DISTINcTlY WIDeR THAN THe DISTAl; pslb 3 A lITTle 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.