Charagmus gressorius (Fabricius, 1792)

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

Charagmus gressorius (Fabricius, 1792)

( FIgS 2–8b )

Body. LeNgTH 6.5–11.5 MM, WIDTH 2.0–3.3 MM. SeTAe MeDIUM lONg TO SHORT. PROTHORAX ( FIg. 2b ) WITH 9 prns, 3 OF THeM PlAceD clOSe TO SPIRAcle. MeSO- AND MeTATHORAX ( FIg. 2b ) eAcH WITH 1 MeDIUM lONg prs AND 4 pds, AlMOST eQUAl IN leNgTH AND 1 as, eps lONg. EAcH PeDAl AReA WITH 6 pda, ONe pda DISTINcTlY lONgeR THAN THe ReMAININg. AbD. VIII ( FIg. 4b ) WITH 1 VeRY SHORT prs AND 4 pds, ts VeRY SHORT, bUT DeVelOPeD.

Head. LIgHT YellOW TO bROWN, SUbcIRcUlAR; WIDTH: 1.20–1.50 MM, leNgTH: 0.70–0.90 MM; eNDOcARINA PReSeNT, ReAcHeS 1/2 THe leNgTH OF FRONS ( FIg. 5A ). Fs 1 INVISIble, fs 3 VeRY SHORT, fs 4 AND fs 5 eQUAl IN leNgTH. 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 4 bASIcONIc SeNSIllAe. LAbRUM ( FIg. 6b ) APPROXIMATelY 2.2 TIMeS AS WIDe AS lONg; ANTeRIOR MARgIN STRONglY SINUOUSlY eMARgINATeD; 2 PAIRS OF elONgATe ams, AlMOST eQUAl IN SIZe , AND 3 PAIRS OF elONgATe als. LAbRAl RODS cONVeRgINg POSTeRIORlY. ClYPeUS ( FIg. 6b ) 3.0 TIMeS AS WIDe AS lONg; ANTeRIOR MARgIN SlIgHTlY cONVeX, lATeRAl MARgIN STRAIgHT; MeDIAN FURROW AS lONg AS leNgTH OF clYPeUS. EPIPHARYNX ( FIg. 7b ) WITH 3 PAIRS OF FINgeR-lIke als; 2 PAIRS OF ams AND 2 PAIRS OF mes. MANDIble TRIDeNTATe , THIRD TOOTH, blUNT. MAXIllA ( FIg. 8b ) WITHOUT mbs; bOTH PAlPOMeReS eQUAl IN leNgTH, bUT bASAl PAlPOMeRe STRONglY WIDeR THAN DISTAl. PRAelAbIUM cORDIFORM, WITH A SINgle PAIR OF ligs; bASAl PAlPOMeRe DISTINcTlY lONgeR AND WIDeR THAN DISTAl, AND All pslb eQUAl IN leNgTH.

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.