Donus tesselatus (Herbst, 1795)

Skuhrovec, Ji Ř Í, 2007, Descriptions of larvae of the tribe Hyperini (Coleoptera: Curculionidae): III. Mature larvae of the genus Donus Jekel, 1865, Zootaxa 1606, pp. 1-28 : 23-24

Donus tesselatus (Herbst, 1795)

Dieckmann 1989: 99.

Material. (4 mature larvae), collected in the field: SLOVAKIA or. (6988), Spišská Nová Ves env., vill. Gánovce (steppe), 18.v.2002, J. Skuhrovec leg. (4) (on Achillea millefolium L.).

Differential diagnosis. Mandible with three teeth (x D. crinitus , D. reichei and Hypera -species) ( Fig. 39 ). Prs and pds1–4 on thoracic segments clubform (x D. austerus , D. comatus , D. crinitus , D. cyrtus , D. intermedius , D. osellai , D. oxalidis , D. palumbarius , and D. reichei ). Pds2 on dorsum of meso- and metathorax not the shortest seta (x D. austerus , D. comatus , D. crinitus , D. cyrtus , D. intermedius , D. osellai , D. oxalidis and D. reichei ). Pds2 and pds3 on meso- and metathorax not close each other (x D. austerus , D. comatus , D. crinitus , D. cyrtus , D. osellai , D. palumbarius and D. reichei ) (all Fig. 40 ). 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 only with one seta (prs) (x D. osellai ). Pds1–5 on abdominal segments I–VII not in line, pds2 positioned anteriad to pds3 and pds4 anteriad to pds5 (x D. austerus , D. comatus , D. crinitus , D. osellai , D. palumbarius and D. reichei ). Pds4 on dorsum of abdominal segments I–VI not the longest seta (x D. palumbarius ) (all Fig. 41 ).

Description of mature larva.

COLORATION. Head pale brown, posterior and lateral margins of epicranium dark. Dorsal side of body green with slightly white median stripe and short white stripes along median stripe.

HEAD. Head width 0.82 mm (0.80–0.88 mm), head length 0.76 mm (0.75–0.80 mm) ( Table. 1 ). Frontal sutures distinct, slender, anteriorly nearly indistinct. Anterior margin of clypeus distinctly concave ( Fig. 64 ) with weak pigmentation. Labrum dark brown; slender anterior margin with deep median excision, posterior margin with short and wide median projection ( Fig. 64 ). Mandibles with three sharp teeth apically ( Fig. 67 ).

THORAX. Spiracle with oval airtubes oriented dorsad.

ABDOMEN. Spiracles with oval airtubes oriented postriad.

CHAETOTAXY. Head. Setae hairform. Des2 minutely shorter than des4, des4 about 0.7 x desl and des5, des3 about 0.7 x des1 and des5 ( Fig. 64 ). Both les long, approximately of same length. Both ves short. Fs1 and fs3 the shortest, less than 0.7 x fs4; fs4 about 0.6 x fs5 ( Fig. 64 ). Both cls about 0.5 x fs1, lrms1–3 shorter than cls1–2 ( Fig. 64 ). Both mds long ( Fig. 67 ). Sts1–2 long; sts3 short, about 0.6 x plbs1–2 ( Fig. 65 ). Dms1–6 stout ( Fig. 66 ), vms1–5 minute. Mxps very short. Plbs2 long, plbs1, 3 about 0.3 x plbs2; prms about 0.5 x plbs2; both lig minute ( Fig. 65 ).

Thorax ( Fig. 68 ). Bases of setae strongly pigmented, setae unpigmented. Setae long, clubform or hairform (dpls, vpls, pda, msts). Prothorax: prn7 short; remaining setae on pronotum longer than prn7, about 1.3 x. Vpls2 about 0.8 x vpls1. Pedal lobe with four (three to five) setae (pda); pda1–2 long, pda2 about 0.75 x pda1; remaining two (one to three) setae minute. Msts minute. Meso- and metathorax: prs and pds1–4 long, pds2–3 shorter than remaining setae; pds1–4 not in line, pds2 positioned anteriad to pds3. Both dls long, both ss long as pds4 and dls. Dpls long, vpls long as dpls. Pedal lobe with four (three to five) setae (pda); pda1–2 long, pda2 about 0.75 x pda1; remaining two (one to three) setae minute. Msts minute.

Abdomen. Bases of setae strongly pigmented, setae unpigmented. Setae long, clubfrom or hairform (vpls, lsts, msts). Abdominal segments I–VIII ( Fig. 69 ): pds1, pds3 and pds5 approximately in line, pds2 positioned anteriad to pds3 and pds4 anteriad to pds5; prs and pds1–5 long, pds2 and pds4 slightly shorter. Sps long as prs. Both dpls shorter than prs, about 0.6 x. Both vpls long. Lsts long, msts minute. Abdominal segment VII: pds3 longer than remaining setae. 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 long, remaining setae about 0.5 x. Abdominal segment IX ( Fig. 70 ): ds1–4 clubfrom to bacilliform; ds2–4 not in line, ds3 anteriad of line joining ds2 and ds4; ds3–4 longer than remaining two setae, about 0.6 x. Both ps clubform to bacilliform, about 0.5 x ds1. Sts1–2 hairform; sts1 very short, sts2 minute.

Remarks. Dieckmann (1989) recorded only coloration of the body and setae; his data agree with that presented here.

Figures

FIGURES 36 – 42. Donus osellai. (36) head, (37) labium and maxilla, (38) maxilla, (39) mandible, (40) thorax, (41) abdominal segment IV, (42) abdominal segment IX; Figs 36, 38 – 39 dorsal view, Fig. 37 ventral view and Figs 40 – 42 lateral view. Scale bar 0.1 mm: a – Figs 40 – 42; b – Fig. 36; c – Figs 37 – 38; d – Fig. 39.

FIGURES 64 – 70. Donus tesselatus. (64) head, (65) labium and maxilla, (66) maxilla, (67) mandible, (68) thorax, (69) abdominal segment IV, (70) abdominal segment IX; Figs 64, 66 – 67 dorsal view, Fig. 65 ventral view and Figs 68 – 70 lateral view. Scale bar 0.1 mm: a—Figs 68 – 70; b—Fig. 64; c—Figs 65 – 66; d—Fig. 67.