Undorosaurus was a medium-sized ichthyosaur which lived in northern Europe during the late Jurassic Period 150-145 million years ago. Fossils of this animal have been found in Norway, Poland, and western Russia. In fact, it was named after the village of Undory in Ulyanovsk Oblast, Russia where its remains were first discovered. Undorosaurus belonged to the ichthyosaur family Ophthalmosauridae, and more specifically to the sub-family Platypterygiinae, and the genus is composed of at least four species: U. gorodischensis, U. kielanae, U. nessovi, and U. trautscholdi. Several specimens have been found, but none of them are complete. As a result, estimates of its total size range from 13-20 feet long; until a complete skeleton is found, we cannot know its true size.
Undorosaurus gorodischensis. © Jason R. Abdale (October 25, 2025).
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Categories: Paleontology, Uncategorized
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