Ophiogomphus (Ophionurus) sinicus ( Chao, 1954 )

Ngo, Quoc Phu & Nguyen, Minh Ty, 2021, The genus Ophiogomphus Lieftinck, 1964 in Vietnam, with descriptions of the female of O. minimus Karube, 2014 and O. phantoani sp. nov. (Odonata: Gomphidae), Zootaxa 5061 (1), pp. 134-144 : 140

Ophiogomphus (Ophionurus) sinicus ( Chao, 1954)

( Figs 12, 13 , 26, 27 , 34, 35 )

Examined specimens. 1 ♂, Nam Toong bridge (22.7853 N, 105.8512 E, altitude 1373 m), Pia Oac National Park, Cao Bang Province, northern Vietnam, 18.v.2015, Q. T. Phan leg.

Notes. This species was described from Guangxi, China ( Chao 1954) and subsequently recorded in Jiangxi, Fujian, Guangdong, and Hong Kong ( Zhang 2019) and northern Vietnam on an internet blog ( Kompier 2014). Ophiogomphus sinicus is the largest representative of the genus in Vietnam (measurements: Abdomen including appendages: 46 mm; Hw 37 mm).

It should be noted here that, Karube (2014: p. 80) stated that the apical 2/3 of male cerci of Ophiogomphus sinicus from Cao Bang Province, North Vietnam are yellowish. However Wilson (per. comm.) has informed us that some specimens of O. sinicus from Hong Kong have entirely blackish-brown cerci. This may represent onto genetic or geographic variability.

Distribution. Vietnam: Cao Bang Province (Pia Oac National Park) ( Fig. 36 ); China: Jiangxi, Fujian, Guangdong and Guangxi Provinces and Hong Kong ( Zhang 2019).

Figures

FIGURE 36. Distribution map of four Ophiogomphus spp. in Vietnam. O. longihamulus (red circle); O. minimus (purple circle); O. phantoani sp. nov. (yellow circle); O. sinicus (green circle). Map background source © GoogleTM Earth Service version 7.3.3.7786.

FIGURES 10–13. Appendages Ophiogomphus spp. in lateral and dorsal view. (10, 11), O. phantoani sp. nov., holotype ♂; (12, 13), O. sinicus, Cao Bang Province.

FIGURES 20–27. Accessory genitalia [20, 22, 24, 26] in lateral view and cornua of glans [21, 23, 25, 27] in ventral view of Ophiogomphus spp. (20–21), O. longihamulus (rearranged from Karube 2014: Fig. 16 e, g); (22, 23), O. minimus (rearranged from Karube 2014: Fig. 18 e, g); (24, 25), O. phantoani sp. nov.; (26, 27), O. sinicus, Cao Bang Province.

FIGURES 28–35. Female occiput [28, 30, 32, 34] & abdominal end [29, 31, 33, 35] in ventral view of Ophiogomphus spp. (28, 29), O. longihamulus (rearranged from Karube 2014: Fig. 16 j, k); (30, 31), O. minimus, Nam Nung Nature Reserve; (32, 33), O. phantoani sp. nov.; (34, 35), O. sinicus (rearranged from Chao 1990: Fig. 10 & Zhang 2019: p. 424).