Sitona obsoletus (Gmelin, 1790)

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 : 418

Sitona obsoletus (Gmelin, 1790)

( FIgS 27–29g )

Body. LeNgTH: 4.4–5.6 MM, MAXIMUM WIDTH (AT THe leVel OF PROcOXAe): 2.4–2.7 MM, HeAD WIDTH (AT THe leVel OF eYeS): 1.0–1.1 MM, PROTHORAX WIDTH (AT WIDeST PlAce): 1.2–1.4 MM (♀, ♂). EYeS RATHeR bIg, HeMISPHeRIcAl. BODY elONgATe, SleNDeR, WHITe. PRONOTUM ROUNDeD, APPROXIMATelY 1.2 TIMeS AS WIDe AS lONg. MeTANOTUM SlIgHTlY lONgeR THAN MeSONOTUM. AbD. I–VI OF AlMOST eQUAl leNgTH, AbD. VII SeMIcIRcUlAR, AbD . VIII NARROW, AbD. IX DISTINcTlY SMAlleR THAN THe PReceDINg SegMeNTS. UROgOMPHI RelATIVelY SHORT, WITH Well ScleROTIZeD APIcAl PART.

Chaetotaxy. SeTAe OF UNeQUAl leNgTH AND SHAPe, DARk YellOW OR bROWN, ON HeAD , ROSTRUM AND THORAX HAIR-FORM, bASeD ON PROTUbeRANceS, ON AbDOMINAl SegMeNTS HAIR- OR THORN-lIke, THe lATTeR bASeD ON DISTINcT PROTUbeRANceS. ROSTRUM WITH A PAIR OF rs; HeAD cAPSUle beARINg 1 vs, 2 sos 1-2, 2 os 1-2 AND 2 pas 1-2 ( FIgS 27g, 29g ). Vs , os 2 AND pas 2 HAIR-lIke, VeRY lONg, ReMAININg SeTAe OF HeAD AND ROSTRUM ARe VISIble ONlY bY HIgH MAgNIFIcATION . PRONOTUM WITH 2 as 1-2, 2 ds 1-2, ls, 2 sls 1-2 AND 2 pls 1-2 ( FIgS 28g, 29g ). All SeTAe OF PROTHORAX PlAceD ON SMAll PROTUbeRANceS, RelATIVelY elONgATe, eQUAl IN leNgTH. MeSO- AND MeTATHORAX eAcH WITH 3 PAIRS OF elONgATe d 1-3, FORMINg A ceNTRAl gROUP ( FIg. 28g ). TeRgAl PARTS OF AbD. I–VII eAcH WITH 7 PAIRS OF PROTUbeRANceS WITH SHORT, THORN-lIke SeTAe WHIcH FORM A RegUlAR TRANSVeRSe ROW AlONg THe POSTeRIOR MARgIN. SeTAe NO. 1, 3, 5 AND 6 DISTINcTlY bIggeR THAN THe ReMAININg, SO AT FIRST VIeW cHAeTOTAXY OF eAcH SegMeNT SeeMS TO cONSIST OF 4 PAIRS OF SeTAe ONlY. AbD . VIII WITH A PAIR OF DISTINcT THORN-lIke SeTAe AND TWO PAIRS OF WeAklY DeVelOPeD, SHORT, HAIR-lIke SeTAe ( FIgS 28g, 29g ). AbD. IX WITH 2 SHORT SeTAe PlAceD clOSe TO UROgOMPHI, AND NeXT 2 lOcATeD DORSAllY ( FIgS 27g, 29g ). 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).