Donus palumbarius (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 : 21-22

Donus palumbarius (Germar, 1821)

Dieckmann 1989: 98–99.

Material. (6 mature larvae), collected in the field: CZ– Bohemia occ. (6348), Brdy mts., vill. Teslíny, Getsemanka, 5.vi.2002, J. Skuhrovec leg. (6) (on Lamium sp.).

Differential diagnosis. Mandible with three teeth (x D. crinitus , D. reichei and Hypera -species) ( Fig. 53 ). Prn1–10 hairform (x D. austerus , D. intermedius , D. osellai , D. palumbarius , D. reichei and D. tesselatus ). 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 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. intermedius , D. oxalidis and D. tesselatus ). Dpls on meso- and metathorax hairform (x D. austerus , D. intermedius and D. reichei ) (all Fig. 54 ). Prn, prs and pds1–4 on thoracic segments and prs, pds1–5 on abdominal segments I–VIII short (x D. cyrtus , D. intermedius , D. oxalidis , H. dauci and H. vidua ) ( Figs 54–55 ). Prs and pds1–5 on abdominal segments I–VIII bacilliform (x D. comatus , D. cyrtus , D. oxalidis and D. tesselatus ). Prodorsum of abdominal segments I–VII only with one seta (prs) (x D. osellai ). 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 the longest seta (x D. austerus , D. comatus , D. crinitus , D. cyrtus , D. intermedius , D. osellai , D. oxalidis , D. reichei and D. tesselatus ) (all Fig. 55 ).

Description of mature larva.

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

HEAD. Head width 1.08 mm (1.00– 1.10 mm), head length 0.99 mm (0.95–1.03 mm) ( Table. 1 ). Frontal sutures distinct, slender, anteriorly nearly indistinct. Anterior margin of clypeus distinctly concave ( Fig. 50 ) with weak pigmentation. Labrum pale brown; anterior margin with deep median excision, posterior margin with short and wide median projection ( Fig. 50 ). Mandibles with three sharp teeth apically ( Fig. 53 ).

THORAX. Spiracle with oval airtubes oriented dorsad.

ABDOMEN. Spiracles with oval airtubes oriented posteriad.

CHAETOTAXY. Head. Setae hairform. Des2 minutely shorter than des4, des4 about 0.8 x des1 and des5, des3 about 0.7 x des1 ( Fig. 50 ). Both les long, les1 about 0.75 x les2. Both ves short. Fs1 and fs3 the shortest, about 0.7 x fs4; fs4 about 0.6 x fs5 ( Fig. 50 ). Both cls short, lrms1–3 short ( Fig. 50 ). Both mds long ( Fig. 53 ). Sts1–2 long; sts3 short, about 0.4 x sts1–2 ( Fig. 51 ). Dms1–6 stout ( Fig. 52 ), vms1–5 minute. Mxps minute. Plbs1, 2 long, plbs3 very short, about 0.4 x plbs1. Prms about 0.7 x plbs2; both lig minute ( Fig. 51 ).

Thorax ( Fig. 54 ). Bases of setae strongly pigmented, setae pigmented. Setae hairform. Prothorax: prn1 the shortest, about 0.6x remaining setae (prn2–10). Vpls2 about 0.8 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: prs and pds1, 3–4 approximately of same length; pds2 very short, about 0.3 x prs. Both dls short, both ss short. Dpls and vpls minutely shorter than prs. 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 pigmented. Setae bacilliform or hairform (dpls, vpls, lsts, msts). Abdominal segments I–VIII ( Fig. 55 ): prs minutely longer than pds5. Pds1–5 not in one line, pds2 positioned anteriad; pds1, 3 and 5 approximately of same length, pds2 about 0.4 pds1, pds4 about 1.4 x pds1. Sps minutely shorter than pds5. Both dpls approximately of same length. Vpls2 long as dpls, vpls1 minute. Lsts very short, msts minute. Abdominal segment VIII: pds2 and pds4 positioned more anteriad from line joining pds1 and pds5 than on abdominal segments I–VII, pds2 positioned more anteriad than pds4; pds1, pds3 and pds5 approximately in line. Abdominal segment IX ( Fig. 56 ): ds1–4 bacilliform; ds2–4 not in line, ds3 posteriad of line joining ds2 and ds4; ds3 the longest, remaining three setae approximately of same length. Both ps hairform, about 0.6 x ds2. 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 50 – 56. Donus palumbarius. (50) head, (51) labium and maxilla, (52) maxilla, (53) mandible, (54) thorax, (55) abdominal segment IV, (56) abdominal segment IX; Figs 50, 52 – 53 dorsal view, Fig. 51 ventral view and Figs 54 – 56 lateral view. Scale bar 0.1 mm: a – Figs 54 – 56; b – Fig. 50; c – Figs 51 – 52; d – Fig. 53.