Donus cyrtus (Germar, 1821)

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 : 11

Donus cyrtus (Germar, 1821)

Material. (11 mature larvae), collected in the field: GREECE mer., prov. Peloponnesse, Kladas env. (Lakonia), 5 km NE of Sparti, 251 m a.s.l., 10.iv.2005, J. Skuhrovec leg. (11) (on Apiaceae ).

Differential diagnosis. Mandible with three teeth (x D. crinitus , D. reichei and Hypera -species) ( Fig. 25 ). Plbs3 short, about 0.5 x plbs2 (x D. oxalidis ) ( Fig. 23 ). Prn, prs and pds1–4 on thoracic segments hairform (x D. austerus , D. intermedius , D. osellai , D. reichei 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. 26 ). Prn, prs and pds1–4 on thoracic segments and prs, pds1–5 on abdominal segments I–VIII very long (x D. austerus , D. comatus , D. crinitus , D. osellai , D. palumbarius , D. reichei and D. tesselatus ) ( Figs 26–27 ). Prs and pds1–5 on abdominal segments I–VIII hairform (x D. austerus , D. crinitus , D. intermedius , D. osellai , D. palumbarius , D. reichei and D. tesselatus ). 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. 27 ).

Description of mature larva.

COLORATION. Head pale brown maculate, posterior margin of epicranium dark. Dorsal side of body green with slightly white median stripe.

HEAD. Head width 0.97 mm (0.85–1.03 mm), head length 0.89 mm (0.78–0.95 mm) ( Table. 1 ). Frontal sutures distinct, slender, anteriorly nearly indistinct. Anterior margin of clypeus weak concave ( Fig. 22 ) with weak pigmentation. Labrum dark brown; anterior margin with deep median excision, posterior margin with short and wide median projection ( Fig. 22 ). Mandibles with three apically rounded teeth ( Fig. 25 ), second tooth largest; first two slightly smaller.

THORAX. Spiracles with oval airtubes oriented posterio-dorsad.

ABDOMEN. Spiracles with oval airtubes oriented posteriad.

CHAETOTAXY. Head. Setae hairform. Des2 minutely shorter than des4; des4 about 0.7 x remaining three setae (des1, des3, des5) ( Fig. 22 ). Both les long, les1 about 0.7 x les2. Both ves short. Fs1 and fs3 shorter than fs4, about 0.7 x; fs4 about 0.6 x fs5 ( Fig. 22 ). Both cls short, lrms1–3 short ( Fig. 22 ). Both mds short ( Fig. 25 ). Sts1–2 long, sts3 shorter than two previous setae, about 0.4 x ( Fig. 23 ). Dms1–6 stout ( Fig. 24 ), vms1–5 minute. Mxps very short. Plbs1–2 long, plbs3 very short, about 0.4 x plbs1–2; prms about 0.8 x plbs2; both lig minute ( Fig. 23 ).

Thorax ( Fig. 26 ). Bases of setae strongly pigmented, setae unpigmented. Setae long, hairform. Prothorax: prn1–10 long; approximately of same length. Vpls1 about 0.5 x vpls2. 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 very long, approximately of same length. Both dls and ss long, minutely shorter than prs. Dpls and vpls as long as dls. 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, hairform. Abdominal segments I–VIII ( Fig. 27 ): pds1, pds3 and pds5 approximately in line, pds2 positioned anteriad to pds3 and pds4 anteriad to pds5; prs and pds1–5 very long, approximately of the same length. Sps long, about 0.5 x prs. Both dpls long, about 0.7 x prs. Vpls2 very long, vpls1 minute. Lsts long, msts minute. Abdominal segment VII: pds3 very long, remaining setae about 0.8 x. Abdominal segment VIII: pds2 positioned more anteriad to pds3 and pds4 more anteriad to pds5; pds1, pds3 and pds5 approximately in line; pds3 very long, remaining setae about 0.8 x. Abdominal segment IX ( Fig. 28 ): ds 2–4 in line; ds1–4 very long, approximately of same length. Both ps long. Sts1 very short, sts2 minute.

Figures

FIGURES 22 – 28. Donus cyrtus. (22) head, (23) labium and maxilla, (24) maxilla, (25) mandible, (26) thorax, (27) abdominal segment IV, (28) abdominal segment IX; Figs 22, 24 – 25 dorsal view, Fig. 23 ventral view and Figs 26 – 28 lateral view. Scale bar 0.1 mm: a—Figs 26 – 28; b – Fig. 22; c – Figs 23 – 24; d – Fig. 25.