Chlorogomphus shanicus Wilson, 2002

Zhang, Haomiao & Tong, Xiaoli, 2013, Descriptions of the final instar larvae of seven Chinese Chlorogomphidae species, with taxonomic notes on adults (Odonata: Anisoptera), Zootaxa 3620 (2), pp. 223-244 : 233

Chlorogomphus shanicus Wilson, 2002

Figures 26–30 , 53 .

Chlorogomphus (Sinorogomphus) shanicus Wilson, 2002: 66 –69, Type locality: Henglongbei, Guangdong.

Material examined. 3 final stage larvae, 28.IX.2010, Dadongshan, Nanling National Nature Reserve (24°56ʹ53ʺN,112°43ʹ27ʺE), 780 m, Lianzhou City, N. Guangdong Province, China, Haomiao Zhang leg.; 3 final stage larvae, 25.III.2009, Sanyatang (23º41'N, 113º47'E), 530 m, Guangzhou City, Guangdong Province, China, Haomiao Zhang leg. 13 and its exuvia, same data, emerged on 15.IV.2009.

Medium-sized chlorogomphid larva with ground color ivory-white.

Head Labrum and clypeus ivory-white. Labrum and postclypeus with central black stripes, anteclypeus with central longitudinal white stripe. Frontal shelf with longitudinal prominence ( Fig. 30 ). Mandibles as in Figs. 26–27 . Mandibular formula:

Left mandible with 6 rounded molar crest, a complanate, b rounded, a> b; incisors pointed, 4>3>2>1; right mandible without molar crest, a and b pointed, a> b; incisors pointed, 4>1>3>2, additional tooth y present on right mandible. Labial mask as in Fig. 28 . Prementum with row of 5 long outer setae and 4–5 smaller inner setae on each side; distal process as in Fig. 29 , bifid lobes angled.

Thorax Ivory-white with long hair-like setae, sides of synthorax black. Pronotum strongly developed, with 3 pairs of black spots; wing pads narrow and strongly divergent, black, reaching posterior margin of S4; femora and tibiae each yellowish with black stripes submedially.

Abdomen Rather slender, ivory-white with conspicuous black spots. S1–5 with a pair of small black spots centrally and a pair of black rings laterally; S6 with black central I-shaped spot, about 1/3 width of segment, and pair of black rings laterally; S7 with pair of black I-shaped spots centrally and pair of black rings laterally; S8–9 with pair of black inverse V-shaped spots dorsally; S10 largely white with pair of black spots close to hind margin of S9. Caudal appendages brown.

Measurements (mm). Total length 39.0–39.5, head width 9.0–9.5, hindwing length 9.0–9.5, width 4.0, hind femur 6.5, prementum length 7.5–8.0, width 8.0.

Distribution. China (Hunan and Guangdong).

Remarks. The larva is very easy to separate from other species by its ivory-white ground color with stable black stripes as well as the slender body. The head is conspicuously broader than the thorax, and the abdomen is narrow. Larvae were abundant in montane forest streams and very active when disturbed, very different from the death-feigning larvae of Chlorogomphus papilio . The species is widespread in Guangdong and also known from the adjacent Hunan Province.

Figures

FIGURES 26 – 30. Larva of Chlorogomphus shanicus: (26) right mandible; (27) left mandible; (28) prementum, dorsal view; (29) bifid branches of frontal margin of prementum; (30) frontal shelf, dorsal view.

FIGURES 50 – 53. Larvae of Chlorogomphidae: (50) Chlorogomphus kitawakii; (51) Chlorogomphus nasutus nasutus; (52) Chlorogomphus papilio; (53) Chlorogomphus shanicus.