Donus oxalidis (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 : 17-21

Donus oxalidis (Herbst, 1795)

Dieckmann 1989: 98.

Material. (4 mature larvae), collected in the field: SLOVAKIA centr. (7286), NP Muráňská planina, Muráň env., Pod Cigánkou (meadow), 22.v.2002, J. Skuhrovec leg. (4) (on Chaerophyllum aromaticum L.).

Differential diagnosis. Mandible with three teeth (x D. crinitus , D. reichei and Hypera -species) ( Fig. 46 ). Plbs3 very short, about 0.3 x plbs2 (x D. cyrtus ) ( Fig. 44 ). 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 close each other (x D. austerus , D. comatus , D. crinitus , D. cyrtus , D. osellai , D. palumbarius and D. reichei ) (all Fig. 47 ). 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 47–48 ). 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. 48 ).

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 1.30 mm ( 1.26–1.35 mm), head length 1.20 mm ( 1.15–1.25 mm) ( Table. 1 ). Frontal sutures distinct, slender, anteriorly nearly indistinct. Anterior margin of clypeus distinctly concave ( Fig. 43 ) with weak pigmentation. Labrum dark brown; slender anterior margin with deep median excision, posterior margin with short and wide median projection ( Fig. 43 ). Mandibles with three sharp teeth apically ( Fig. 46 ).

THORAX. Spiracle with oval airtubes oriented postriad.

ABDOMEN. Spiracles with oval airtubes oriented posterio-dorsad.

CHAETOTAXY. Head. Setae hairform. Des2 the shortest, about 0.5 x des1, des4 and des5; des1 about 0.5 minutely shorter than des1 and des3 ( Fig. 43 ). Both les long, approximately of same length. Both ves short. Fs1 and fs3 short, about 0.6 x fs4; fs4 about 0.5 x fs5 ( Fig. 43 ). Both cls short, lrms1–3 short ( Fig. 43 ). Mds2 very short, about 0.5 x mds1 ( Fig. 46 ). Sts1–2 long; sts3 short, about 0.4 x sts1–2 ( Fig. 44 ). Dms1–6 stout ( Fig. 45 ), vms1–5 minute. Mxps very short. Plbs1–2 short, plbs3 very short, about 0.2 x plbs1–2; prms about 0.5 x plbs1; both lig minute ( Fig. 44 ).

Thorax ( Fig. 47 ). Bases of setae strongly pigmented, setae unpigmented. Setae long, hairform. Prothorax: prn1–10 long, approximately of same length; prn8 the shortest one. Both vpls2 approximately of same length. Pedal lobe with five (three to six) setae ( pda); pda1–2 long, pda2 about 0.75 x pda1; remaining three (one to four) setae minute. Msts minute. Meso- and metathorax: prs and pds1–4 very long, approximately of same length, bases of setae broad enlarged more than remaining bases of setae; pds1–4 not in line, pds2 positioned anteriad to pds3. Both dls short, about 0.3 x prs; both ss short as dls. Dpls and vpls longer than ss, about 1.4 x. Pedal lobe with five (three to six) setae ( pda); pda1–2 long, pda2 about 0.75 x pda1; remaining three (one to four) setae minute. Msts minute.

Abdomen. Bases of setae strongly pigmented, setae unpigmented. Setae long, hairform. Abdominal segments I–VIII ( Fig. 48 ): pds1, pds3 and pds5 approximately in line, pds2 positioned anteriad to pds3 and pds4 anteriad to pds5; prs and pds1–5 very long, pds2, pds4 and pds5 slightly shorter; bases of setae broad enlarged more than remaining bases of setae. Sps short, about 0.3 x prs. Both dpls long as pds5. Vpls2 long, vpls1 very short. Lsts short, msts minute. Abdominal segment VII: pds2 positioned more anteriad to pds3 and pds4 more anteriad to pds5; pds3 the longest, pds2 and pds4 about 0.7 x. Abdominal segment VIII: pds2 and pds4 positioned more anteriad from line joining pds1 and pds5 than on abdominal segments I–VIII; pds3 very long, pds2 and pds4 about 0.7 x. Dpls1 slightly shorter than dpls2. Abdominal segment IX ( Fig. 49 ): ds 2–4 in line; ds1 the longest, remaining three setae approximately of same length. Ps1 long as 0.5 x ds2, ps2 about 0.7 x ps1. 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 43 – 49. Donus oxalidis. (43) head, (44) labium and maxilla, (45) maxilla, (46) mandible, (47) thorax, (48) abdominal segment IV, (49) abdominal segment IX; Figs 43, 45 – 46 dorsal view, Fig. 44 ventral view and Figs 47 – 49 lateral view. Scale bar 0.1 mm: a – Figs 47 – 49; b – Fig. 43; c – Figs 44 – 45; d – Fig. 46.