Idionyx selysi Fraser, 1926

Zhang, Haomiao & Tong, Xiaoli, 2010, Descriptions of the final instar larvae of three Chinese Idionyx species (Odonata: Anisoptera: Corduliidae), Zootaxa 2716, pp. 53-63 : 56

publication ID

https://doi.org/ 10.5281/zenodo.199729

DOI

https://doi.org/10.5281/zenodo.6198865

persistent identifier

https://treatment.plazi.org/id/03DB87B9-FF8E-FFDA-14BE-FC39FCCCB6BA

treatment provided by

Plazi

scientific name

Idionyx selysi Fraser, 1926
status

 

Idionyx selysi Fraser, 1926 View in CoL

Figures 12–20 View FIGURES 12 – 15 View FIGURES 16 – 20 , 32–33 View FIGURES 30 – 35 , 36–37 View FIGURES 36 – 41. 36 – 37

Material examined. 1 ɗ and its exuviae, 01.IX.2009, Mengla (21°37ʹ0 4ʺN, 101°35ʹ0 3ʺE), Xishuangbanna, Yunnan Province, China, Haomiao Zhang leg.; 1 final stage larva, same data but 03.IX.2009; 1 Ψ and its exuviae, same data, emerged on 30.IX.2009.

Ground color of body yellowish brown with dark brown maculation ( Fig. 36 View FIGURES 36 – 41. 36 – 37 ). Small sized with total body length 14.0 mm, head width maximum 4.0 mm; length of hind femur 4.5 mm.

Head—Yellowish brown without conspicuous maculation. Eyes large, knob-like; antefrons and hind margin of eyes with short setae; upper surface of frontal plate concave; mandibles similar to I. carinata ( Figs 32–33 View FIGURES 30 – 35 ) and with same mandibular formula as in I. carinata , but apices of incisors 1, 3 and 4 pointed; clypeus and labrum entirely concealed beneath broad labial mask ( Fig. 12 View FIGURES 12 – 15 ); postmentum extending about halfway between mid and hind coxae; premental setae: 5+4 / 4+5; apex of prementum not bifid, with robust setae, and its distal margin lacking conspicuous crenulations, with 11–13 spiniform setae on each side; palpal lobes strongly developed ( Fig. 13 View FIGURES 12 – 15 ), their inner margin with 8 teeth, all with spiniform marginal setae, the outermost one triangle-shaped, others rounded, dark brown; outer margin of lobes with a row of setae; palpal setae: 5 / 5; moveable hook short and pointed at apex. Antennae filiform, 7-segmented ( Fig. 15 View FIGURES 12 – 15 ). Length of each antennal segments (mm): 0.16: 0.28: 0.25: 0.17: 0.17: 0.17: 0.25.

Thorax—Thorax almost as broad as the transverse diameter of head. Pronotum strongly developed ( Fig. 14 View FIGURES 12 – 15 ) with 3 transverse depressions; synthorax fringed with long setae; wing pads strongly divergent extending to middle of S7. Legs long and slender, femora and tibiae each with 4–5 long, stout, prostrate, clavate setae; front femora yellowish with a dark brown stripe subdistally; middle and hind femora yellowish with two dark brown stripes submedially; tibiae yellowish with a dark brown marking basely.

Abdomen—Short and oval, depressed, ground color yellowish brown, all segments fringed laterally with long hair-like setae; S4 & 10 with a pair of small dark brown spots dorsally, S5–9 with two pairs of dark brown spots dorsally, S5–8 with a pair of central brown spots ventrally; dorsal hooks absent; large lateral spines present only on S8 & 9; S10 short; anal appendages short, epiproct and paraprocts straight, triangular, cerci subequal to paraprocts in length.

Distribution. China (Yunnan), Laos, Burma, and Thailand

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Odonata

Family

Corduliidae

Genus

Idionyx

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