Chlorogomphus usudai Ishida, 1996

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 : 233-236

Chlorogomphus usudai Ishida, 1996

Figures 31–35 , 54 .

Chlorogomphus usudai Ishida, 1996: 51 –54, Type Locality: Tongza, Hainan. Aurorachlorus usudai: Chao, 1999: 4 –5.

Chlorogomphus icarus: Wilson & Reels, 2001: 172 –173, figs. 67–75. Syn. nov. Chlorogomphus (Orogomphus) usudai: Wilson, 2002: 69 –70.

Material examined. final stage larvae: 13, 30.VIII.2005, Yinggeling Nature Reserve (18°58ʹ76ʺN, 109°24ʹ27ʺE), Hainan Province, Liusheng Chen leg.; 13, 23.IV.2009, Diaoluoshan Nature Reserve (18°43ʹ37ʺN, 109°52ʹ20ʺE), Hainan Province, Haomiao Zhang leg.

Small chlorogomphid larva, ground color brownish yellow with brown maculation.

Head Labrum and clypeus pale yellow. Labrum and postclypeus with brown central spots. Frontal shelf similar to that of C. nasutus ( Fig. 35 ). Mandibles as in Figs. 31–32 . Mandibular formula:

Left mandible with 4 rounded molar crest, a complanate, b obtuse, a> b; incisors pointed, 4>3>2>1>2’; right mandible without molar crest, a and b pointed, a> b; teeth of the incisors pointed, 4>1>3>2, additional tooth y present on the right mandible. Labial mask as in Fig. 33 . Prementum with row of 5 long outer setae and 3–5 smaller inner setae on each side. Distal process as in Fig. 34 ; lobes angled and each lobe bent slightly outwards.

Thorax Brownish yellow with long hair-like setae; pronotum with pair of black spots close to anterior margin; wing pads brownish yellow and broad, reaching middle of S6. femora and tibiae with black stripes submedially.

Abdomen Brownish yellow with brown spots. S1–4 with two pairs of inconspicuous spots; S5–6 largely black centrally, with pair of scaphoid spots laterally; S7–9 with pair of oblique spots centrally and pair of scaphoid spots laterally, less developed than those on S5–6; S10 and anal appendages without spots.

Measurements (mm). Total length 33.0–33.5, head width 8.0–8.2, hind wing length 8.5, width 4.0, hind femur 6.0, prementum length 7.0, width 7.5.

Distribution. China (Hainan).

Remarks. This is a relatively small larva with very broad wing pads. It is only known from Hainan island and is widespread in the montane area. Two Chlorogomphus species were recorded from Hainan island, C. gracilis and C. usudai , and larva of C. usudai was confirmed from the streams in Yinggeling Reserve, where C. gracilis is absent and the adults of C. usudai are common.

Figures

FIGURES 31 – 35. Larva of Chlorogomphus usudai: (31) right mandible; (32) left mandible; (33) prementum, dorsal view; (34) bifid branches of frontal margin of prementum; (35) frontal shelf, dorsal view.

FIGURES 54 – 59. Larvae of Chlorogomphidae: (54) Chlorogomphus usudai; (55 – 58) Chlorogomphus yokoii; (59) Chloropetalia soarer.