A fossil of a prehistoric, fish-eating, crocodile-like, aquatic reptile at the natural history museum in Leiden.

It's a Mesosaurus that lived during the early Permian period, roughly 320 to 280 million years ago.

Mesosaurs on wikipedia

Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Subclass: Anapsida
Order: Mesosauria
Family: Mesosauridae
Genus: Mesosaurus



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