old fossil of a prehistoric water snail shell, pleurotomania a extinct specie, on a black background

ancient animal animals background black bone bones extinct fish fishes fossil fossils gastropod gastropods geological geology historical history house ichthyology isolated jurassic life marine ocean old paleontology period pleurotomania pleurotomaria pleurotomariidae prehistoric prehistorical prehistory remain remains research science sea shell skeleton slit slug slugs snail snails specie species time water