The genus Ophiogomphus Lieftinck, 1964 in Vietnam, with descriptions of the female of O. minimus Karube, 2014 and O. phantoani sp. nov. (Odonata: Gomphidae) Author Ngo, Quoc Phu Center for Entomology & Parasitology Research, College of Medicine & Pharmacy, Duy Tan University, Da Nang 550000, Vietnam. Institue of Applied Technology, Thu Dau Mot University, No. 06 Tran Van On, Phu Hoa Ward, Thu Dau Mot City, Binh Duong province, Vietnam. https: // orcid. org / 0000 - 0002 - 2023 - 1813 Author Nguyen, Minh Ty 0000-0002-2023-1813 text Zootaxa 2021 2021-11-03 5061 1 134 144 journal article 3612 10.11646/zootaxa.5061.1.6 0e4f0459-0892-43b2-b01d-50f384c6c945 1175-5326 5679421 AED1C537-0DEF-4356-BDE9-E590A9EBCDD3 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 ).