Donus osellai Winkelmann, 2001

Donus osellai Winkelmann, 2001 View in CoL

Material. (8 mature larvae), collected in the field: ITALY bor., Sella Nevea, Monte Canin, 1800–2000 m a.s.l., 26.vi.2004, H. Winkelmann leg. (8) (on Achillea clavennae L.).

Differential diagnosis. Mandible with three teeth (x D. crinitus , D. reichei and Hypera -species) ( Fig. 39 View FIGURES 36 – 42 ). Prs and pds1–4 on thoracic segments bacilliform (x D. comatus , D. cyrtus , D. oxalidis , D. palumbarius and D. tesselatus ). Pds2 on dorsum of meso- and metathorax not the shortest seta (x D. palumbarius and D. tesselatus ). Pds2 and pds3 on meso- and metathorax not close each other (x D. intermedius , D. oxalidis and D. tesselatus ) (all Fig. 40 View FIGURES 36 – 42 ). Prn, prs and pds1–4 on thoracic segments and prs, pds1–5 on abdominal segments I–VIII short (x D. cyrtus , D. intermedius and D. oxalidis ) ( Figs 40–41 View FIGURES 36 – 42 ). Prs and pds1–5 on abdominal segments I– VIII bacilliform or clubform (x D. comatus , D. cyrtus and D. oxalidis ). Prodorsum of abdominal segments I– VII with two setae ( prs1–2) (x D. austerus , D. comatus , D. crinitus , D. cyrtus , D. osellai , D. oxalidis , D. palumbarius , D. reichei and D. tesselatus ). Pds 1–5 in line on abdominal segments I–VII, not pds2 positioned anteriad to pds3 and pds4 anteriad to pds5 (x D. cyrtus , D. intermedius , D. oxalidis and D. tesselatus ). Pds4 on dorsum of abdominal segments I–VI not the longest seta (x D. palumbarius ) (all Fig. 41 View FIGURES 36 – 42 ).

Description of mature larva.

COLORATION. Head orange, posterior and lateral margins of epicranium dark. Dorsal side of body pale caesious with slightly white median stripe.

HEAD. Head width 0.77 mm ( 0.75–0.80 mm), head length 0.69 mm ( 0.68–0.70 mm) ( Table. 1 View TABLE 1 ). Frontal sutures distinct, slender, anteriorly nearly indistinct. Anterior margin of clypeus distinctly concave ( Fig. 36 View FIGURES 36 – 42 ) with strong pigmentation. Labrum dark brown; anterior margin with deep median excision, posterior margin with short and wide median projection ( Fig. 36 View FIGURES 36 – 42 ). Mandibles with three sharp teeth apically ( Fig. 39 View FIGURES 36 – 42 ).

THORAX. Spiracle with oval airtubes oriented posterio-dorsad.

ABDOMEN. Spiracles with oval airtubes oriented postrio-dorsad.

CHAETOTAXY. Head. Setae hairform. Des2 minutely shorter des4, des4 about 0.8 x des5, des5 about 0.7 x des1 and des3 ( Fig. 36 View FIGURES 36 – 42 ). Both les long, approximately of same length. Both ves short. Fs1 the shortest, about 0.7 x fs3; fs3 about 0.7 x fs4; fs4 about 0.7 x fs5 ( Fig. 36 View FIGURES 36 – 42 ). Both cls short, lrms1–3 short ( Fig. 36 View FIGURES 36 – 42 ). Both mds short ( Fig. 39 View FIGURES 36 – 42 ). Sts1–2 long, sts3 very short ( Fig. 37 View FIGURES 36 – 42 ). Dms1–6 stout ( Fig. 38 View FIGURES 36 – 42 ), vms1–5 minute. Mxps minute. Plbs2 short, plbs1, 3 very short, about 0.3 x plbs2; prms long as plbs1; both lig minute ( Fig. 37 View FIGURES 36 – 42 ).

Thorax ( Fig. 40 View FIGURES 36 – 42 ). Bases of setae strongly pigmented, setae unpigmented. Setae short, clubform or bacilliform to hairform ( dpls, vpls, pda, msts). Prothorax: prn1, 7 very short, about 0.5 x remaining setae on pronotum. Vpls2 about 0.5 x vpls1. Pedal lobe with three (three to five) setae ( pda); pda1–2 long, pda2 about 0.75 x pda1; remaining one (one to three) seta minute. Msts minute. Meso- and metathorax: pds2, pds4 on mesothorax and pds2–4 on metathorax short, about 0.5 x prs, pds1, 3 on mesothorax and prs, pds1 on metathorax. Dls1–2 not closed each other; dls1 short as pds4, dls2 longer than dls1, about 1.3 x. Ss long as dls1. Dpls and vpls long as dls2. Pedal lobe with three (three to five) setae ( pda); pda1–2 long, pda2 about 0.75 x pda1; remaining one (one to three) seta minute. Msts minute.

Abdomen. Bases of setae strongly pigmented, setae unpigmented. Setae short, clubform or bacilliform to hairform ( dpls, vpls, lsts, msts). Abdominal segments I–VIII ( Fig. 41 View FIGURES 36 – 42 ): pds1–5 approximately in line, pds2 and pds4 positioned slightly anteriad; pds2–5 short, about 0.6 x pds1. Prs1 long as pds1, prs2 short as pds2. Sps long as prs2. Both dpls long as pds1. Vpls2 long, vpls1 minute. Lsts long as dpls1–2, msts minute. Abdominal segment VII: pds2 and pds4 positioned slightly anteriad, pds3 slightly posteriad. Abdominal segment VIII: pds2 and pds4 positioned more anteriad from line joining pds1 and pds5 than on abdominal segments I–VII, pds4 positioned more anteriad than pds2; pds1, pds3 and pds5 approximately in line; pds3 longer than remaining setae. Abdominal segment IX ( Fig. 42 View FIGURES 36 – 42 ): ds1–4 bacilliform; ds 2–4 in line; ds3 the longest, remaining three setae approximately of same length. Both ps bacilliform; shorter than ds1–4, about 0.5 x. Both sts hairform, sts1 very short, sts2 minute.