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Sauroposeidon was a sauropod from the Early Cretaceous Period, related to the more famous Brachiosaurus. The only specimen to date is represented by four neck vertebrae. It was the tallest dinosaur known, estimated at 18 m (60 ft).
Its name is Greek for "lizard-Poseidon". The Greek sea-god Poseidon was also known as Ennosigaios or Enisokhthōn = "Earthshaker". The reference here is to the ground shaking under its weight as it walked: compare Seismosaurus.