During the Late Jurassic, numerous large marine animals inhabited the warm tropical seas of the Mesozoic world. While many of these belonged to various aquatic reptile groups, such as the Ichthyosaurs and Plesiosaurs, the most massive creature in the seas was a genus of ray finned fish known as Leedsichthys. Belonging to a once diverse and successful order, the Pachycormiformes, Leedsichthys was a gargantuan filter feeder that superficially resembled modern basking sharks. Modern studies have significantly reduced the length of this genus to a still impressive maximum size of 16.5m or 54 feet and a potential mass of at least 40 tonnes. This is roughly equivalent to the modern filter feeding whale shark in terms of size, making Leedsichthys by far the largest ray finned fish to ever exist. The genus died out during the Tithonian stage of the Late Jurassic approximately 152 million years ago, possibly due to climatic changes.
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25 сен 2021
