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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.