Ophiogomphus (Ophionurus) longihamulus Karube, 2014

(Figs 20, 21, 28, 29)

Notes. This species was described from Pia Oac National Park of northern Vietnam based on male and female specimens (Karube 2014). Ophiogomphus longihamulus is characterized by its long anterior hamuli (Fig. 20).

Distribution (Fig. 36). Vietnam: Cao Bang Province; China: Yunnan Province (Karube 2014; Zhang 2019).