TL;DR: Specific features of skeleton structure in all three genera of Halosauridae fish are described and it is recommended to use the obtained results for the specification of classification of these fish.
Abstract: With reference to three species (Halosaurus pectoralis (McCulloch, 1926), Halosauropsis macro-chir (Gunther, 1878), and Aldrovandia phalacra (Vaillant, 1888)), specific features of skeleton structure in all three genera of Halosauridae fish are described. It is recommended to use the obtained results for the specification of classification of these fish.