Chlorogomphus nasutus nasutus Needham, 1930

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 : 228

Chlorogomphus nasutus nasutus Needham, 1930

Figures 11–16 , 51 .

Chlorogomphus nasutus Needham, 1930: 97 , Type locality: Jiangxi; Klotsi, 1947: 3–4, figs. 3–4, 7–8; Chen, 1950: 142, 144–147, figs. 6, 18; Asahina, 1956: 224–225, figs. 42–45.

Chlorogomphus n. nasutus: Wilson, 2005: 112 .

Sinorogomphus nasutus: Carle, 1995: 390 ; Chao, 1999: 2.

Chlorogomphus (Sinorogomphus) n. nasutus: Zhang & Tong, 2010: 343 –344.

Material examined. final stage larvae: 1Ƥ, 16.IX.2008, Nankunshan Nature Reserve (23º38'N, 113º50'E), Guangdong Province, China, Haomiao Zhang leg.; 13, 08.X.2009, Nanling National Nature Reserve (24°55ʹ42ʺN, 113°01ʹ02ʺE), Guangdong Province, China, Haomiao Zhang leg.; 1Ƥ, 25.III.2009, Sanyatang (23º41'N, 113º47'E), Conghua, Guangdong Province, China, Haomiao Zhang leg.; 13 and its exuvia, same data, emerged on 02.V.2010. Large chlorogomphid larva, ground color brownish yellow with conspicuous black maculation.

Head Labrum and clypeus ivory-white. Labrum and clypeus without spots. Frontal shelf housetop-shaped when viewed frontally, upper surface with conspicuous longitudinal central prominence ( Figs. 11–12 ). mandibles as in Figs. 13–14 . Mandibular formula:

Left mandible with 6 rounded molar crest, a complanate, b obtuse, a> b; incisors obtuse, 4>3>2>1; right mandible without molar crest, a and b pointed, a> b; incisors rounded, 4>1>3>2, additional tooth y present on right mandible. Labial mask as in Fig. 15 . Prementum with row of 5 long outer setae and 2-3 smaller inner setae on each side; Distal process as in Fig. 16 , bifid lobes angled.

Thorax Brownish yellow with long hair-like setae, sides with very broad black stripes; pronotum with 2 pairs of black rounded spots close to anterior margin; wing pads black, reaching middle of S5; femora and tibiae with long filiform setae and black stripes submedially.

Abdomen Ground color brownish yellow with black spots, S1–5 with pair of small black central spots and pair of black rings laterally; S6 with black middorsal stripe, about 1/3 width of segment, and pair of yellow circles laterally; S7–9 with pair of black I-shaped spots centrally and pair of black crescent-shaped spots laterally; lower side of S10 black; epiproct dark brown basally and yellow distally, with large yellow basal spot, apex pointed and dark brown; paraprocts dark brown basally and yellow distally, apex pointed and dark brown.

Measurements (mm). Total length 40.0–44.5, head width 10.0–10.5, hindwing length 10.8–11.0, width 4.0, hind femur 7.5, prementum length 8.0–9.0, width 8.5–9.0.

Distribution. China (Sichuan, Guizhou, Zhejiang Fujian, Hunan, Guangxi, Guangdong).

Remarks. The habitat of this larva is very narrow forest streams, usually with moderate gradient, and thus differs from the open streams of most other congeners. This is a large larva with a very broad head and spotted body. For behavior of the adult, see Zhang and Tong (2010).

Figures

FIGURES 11 – 16. Larva of Chlorogomphus nasutus nasutus: (11) frontal shelf, dorsal view; (12) head, frontal view; (13) right mandible; (14) left mandible; (15) prementum, dorsal view; (16) bifid branches of frontal margin of prementum.

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