Dunkleosteus means Dunkles Bone and is named after paleontologist David Dunkle. It was a big predatory pre-historic fish that lived during the Late Devonian period (around 380-360 million years ago).Dunkleosteus were 30ft long and weighed 3-4 tons. They had a hard armor plating a bulging head and big toothless jaws. Hand-painted dinosaur toy. Designed by experts CollectA dinosaur models are factually accurate and true to life.