##plugins.themes.huaf_theme.article.main##
Abstract
During the survey of the Myxozoan parasites of marine fishes in the coastal areas of Vietnam in 2017 - 2018, twenty-five fishes of Torpedo scad Megalaspis cordyla were examined in Quang Binh and Khanh Hoa provinces. By using the morphology method, spores of Auerbachia chakravartyi Narasimhamurti, Kalavati, Anuradha, Padma, 1990 was found in the gall bladder of 8/25 fishes (35%) of Torpedo scad Megalaspis cordyla Linnaeus, 1758 (Carangidae) with mature spores floating free in bile. Spores were club-shaped with smooth valves and contain one polar capsule with a single polar filament. Two shell valves were asymmetric, dissimilar in form and connected with the unclear sutural line. Spores measured 17.53 ± 1.1 (15.8–20.7) μm in total length, 7.73 ± 0.32 (7.07-8.33) μm in width, 8.80 ± 0.84 (7.63-10.35) μm in caudal extension length. Polar capsule measured 8.5 ± 0.7 (5.8–9,6) μm in length and 3.9 ± 0.3 (3.5–4.2) μm in width. The small subunit rDNA (SSU rDNA) sequence showed that the present species in this study is a member of genus Auerbachia and most closely with Auerbachia maamouni (KX165336) with sequence similar of 99% (1472/1486) bp. This is the first description of Auerbachia chakravartyi species in the marine fish from Vietnam.