NOTE: According to entries in the Paleobiology Database / Fossilworks, see here and here it seems that Hydrorion is a junior synonym of Microcleidus because the only assigned species Hydrorion brachypterygius has been reassigned to Microcleidus as Microcleidus brachypterygius. Thus, Hydrorion seems to have become a nomen dubium.
<nowiki>Hydrorion; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; هیدروریون; 水猎龙属; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; Hydrorion brachypterygius; specie di animali della famiglia Plesiosauridae; সরীসৃপের প্রজাতি; espèce de reptile; вид плазунів; soort uit het geslacht Hydrorion; species of reptile; especie de reptil; Art der Gattung Hydrorion; species of reptile; speiceas reiptílí; نوع من الزواحف; вид влечуго; species of reptile</nowiki>
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