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    Descriptions of the nymphal stages of Gestroiella limnocoroides Montandon, 1897 (Hemiptera: Naucoridae)
    (Vietnam Academy of Science and Technology, 2025) Phan Thi Giang; Truong Xuan Lam; Ha Ngoc Linh; Ryndevich, S. К.; Nguyen Quang Cuong; Рындевич. С. К.
    Gestroiella limnocoroides Montandon, 1897, a species belonging to the subfamilyCheirochelinae has been recorded from Vietnam for the first time nearly 20 years ago. This study presents the first descriptions of the nymphal stages of the species. All five nymphal instars are described and illustrated in detail. Both adults and nymphs of G. limnocoroides were collectedfrom vegetated stream margins in Vu Quang National Park, Ha Tinh province, where no otherclosely related species were observed. Each nymphal instar exhibits a head with a square-shapedventral margin that is dark brown in color; a pronotum with a squarely concave anterior marginand a convex posterior margin that curves posteriorly; and a dorsal surface marked withalternating dark and light brown spots and two distinct black dots. Additionally, a morphometricanalysis based on 22 morphological traits is provided for the nymphal stages.
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    First record of true bugs (Hemiptera: Heteroptera) and beetles (Coleoptera) for Na Khau Natural Reserve in Vietnam
    (Гродно : ГрГУ, 2023) Lukashuk, А. О.; Рындевич, С. К.; Ryndevich, S. K.; Truong Xuan Lam
    For the first time, a list of water true bugs and beetles from the Na Ho Reserve (Northern Vietnam) is given in the paper. Seven species of water true bugs from families Corixidae, Notonectidae, Helotrephidae, Veliidae, Gerridae and 6 species of water beetles from families Noteridae and Dytiscidae have been identified. Among them, 1 species of water true bugs (Sigara kempi Hutchinson, 1940), and 1 species of water beetles (Cybister sugillatus Erichson, 1834) are new for Vietnam fauna. Canthydrus angularis Sharp, 1882, Hydaticus ricinus Wewalka, 1979 and Sandracottus mixtus (Blanchard, 1843) are recoded for the first time for Yen Bai Province. Впервые приводится список водных клопов и жуков заповедника На Хо (Северный Вьетнам). Выявлено 7 видов водяных клопов из семейств Corixidae, Notonectidae, Helotrephidae, Veliidae, Gerridae и 6 видов водяных жуков из семейств Noteridae и Dytiscidae. Один вид водных клопов (Sigara kempi Hutchinson, 1940) и один вид водных жуков (Cybister sugillatus Erichson, 1834) являются новыми для вьетнамской фауны. Водные жесткокрылые Canthydrus angularis Sharp, 1882, Hydaticus ricinus Wewalka, 1979 и Sandracottus mixtus (Blanchard, 1843) впервые указываются для провинции Йен Бай.
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    Notes on genus Cybister Curtis, 1827 (Coleoptera: Dytiscidae) with the first records of Cybister danxiaensis Zhuo-Yin Jiang and Cybister convexus Sharp from Vietnam
    (Publishing House for Science and Technology, 2024) Nguyen Quang Cuong; Nguyen Thanh Manh; Phan Thi Giang; Ryndevich, S. K.; Truong Xuan Lam; Рындевич, С. К.
    The genus Cybister Curtis, 1827 is reviewed for the fauna of Vietnam. The 5 species are diagnosed with illustrated habitus, leg, and male genitalia. Additional measurement data, and an updated identification key for all species are provided. Two species Cybister convexus Sharp, 1882, and Cybister danxiaensis Zhuo-Yin Jiang, 2023, are recorded for the first time in Vietnam.
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    Notes on genus Laccotrephes Stål, 1866 (Hemiptera: Nepidae: Nepinae) from Vietnam, with the description of the female of Laccotrephes longicaudatus Nieser, Zettel & Chen, 2009
    (2022) Tran Thi Phuong Uyen; Nguyen Quang Cuong; Ryndevich, S. K.; Nguyen Thi Hanh; Truong Xuan Lam; Рындевич, С. К.
    A taxonomic study of the genus Laccotrephes Stål, 1866 from Vietnam is presented. Four species of the genus Laccotrephes have been identified in Vietnam: Laccotrephes pfeiferiae (Ferrari, 1888), Laccotrephes longicaudatus Nieser, Zettel & Chen, 2009, Laccotrephes simulatus Montandon, 1913 and Laccotrephes grossus (Fabricius, 1787). The female of the species Laccotrephes longicaudatus Nieser, Zettel & Chen is described for the first time. A key to the species of genus Laccotrephes known from Vietnam is also provided.
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    The Laccotrephes robustus Stål, 1871 (Hemiptera: Nepidae: Nepinae) in Vietnam, with notes on its’ morphological and DNA analyses
    (Publishing House for Science and Technology, 2024) Dai Dac Nguyen; Phan Thi Giang; Ha Ngoc Linh; Nguyen Quang Cuong; Nguyen Thi Hanh; Nguyen Thanh Manh; Ryndevich, S. K.; Truong Xuan Lam; Рындевич, С. К.
    The genus Laccotrephes Stål, 1865 has been known in Vietnam with four species, Laccotrephes grossus (Fabricius, 1787), Laccotrephes longicaudatus Nieser, Zettel & Chen, 2009, Laccotrephes pfeiferiae (Ferrari, 1888) and Laccotrephes simulatus Montandon, 1913. The species Laccotrephes robustus Stal, 1871 is a species endemic to the Philippines, first recorded in Vietnam from specimens collected in Cao Bang, Bac Kan and Nghe An provinces. The occurrence of L. robustus in Vietnam was confirmed by morphological and molecular data.