Stenopterygius quadricissus, Ichthyosaur skull Ankylosaurus Primitive Echinoderms first appeared in

Primitive Echinoderms first appeared in the fossil record 570 million years ago in the Lower Cambrian Period

Lucy is the common name of AL 288-1

Roy Chapman Andrews gave the name Oviraptor philoceratops (egg eater) to a dinosaur they found lying on top of a nest of what they thought were Protoceratops eggs

and to stimulate further interest on the study of fossils among young readers

Stenopterygius quadricissus, Ichthyosaur skull Ankylosaurus Primitive Echinoderms first appeared inStenopterygius quadriscissus is an extinct genus of ichthyosaur from the Early to Middle Jurassic from Europe. Maximum length was 4 m. The habits of Stenopterygius were similar to those of present day dolphins. It spent most of its life in the open sea, where it hunted fish, cephalopods and other animals. Ichthyosaur infants were born tail first, to prevent them from drowning before fully clearing the birth canal. Stenopterygius was a very fast