Coprolite Fossilised dung. The droppings of prehistoric animals. Crinoid Crinoids are echinoderms, a group of animals that also includes the sea-urchins and starfish. Their superficial flower-like appearance led to their popular name sea lilies . In the Palaeozoic era crinoids were abundant but they started to decline during the Mesozoic era.
Today there are only a few, mostly free-swimming, forms.
They have changed very little in their history, nearly all being aquatic or semi-aquatic hunters and scavengers. Crustacean A class of arthropods that includes crabs, lobsters, wood-lice, barnacles and waterfleas. They evolved in the Cambrian period, or maybe even earlier, and became diverse and numerous in the Mesozoic era. Cryolophosaurus Cryolophosaurus, meaning frozen crested reptile , was a bipedal, meat-eating dinosaur, about 6 metres long. It had a horn-like, upward pointing crest above its eyes.