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Lepisosteiform Fish (Holostei) Ganoid Scales from the Middle Jurassic Deposits of Ukraine. Kovalchuk, О. М., Anfi mova, G. V. — Gars (Lepisosteiformes) fl ourished in epicontinental seas throughout the world during the second half of Mesozoic and early Cenozoic. Cretaceous and Paleogene remains of these fi shes are common in Europe while their Jurassic fossils are still relatively scarce. Here we re-describe in detail a series of ganoid scales from the latest Middle Jurassic (Callovian) deposits of Pekari (Cherkasy Region, Ukraine). Th ese fossils were identifi ed by Professor O. S. Rogovich in 1861 as those that belong to Lepidotus mantellii and L. fi ttoni. Th e referral of these scales to a certain species should be considered with caution because the described material lacks characters suffi cient for identifi cation it even to the genus or family. We consider to identify these fossils as Lepisosteiformes gen. et sp. indet. An overview of currently known Jurassic occurrences of lepisosteiform fi shes is also presented in the paper.

Lepisosteiform fish (Holostei) ganoid scales from the middle jurassic deposits of Ukraine