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, which belong to the Archosaur clade, as do the dinosaurs. Other archosaurs include the crocodilians (crocodiles, alligators, etc.) 
and the birds 
, and pterosaurs. (All dinosaurs lived on land; none of them flew or lived in the seas.)
Many well-known animals lived before the dinosaurs did. Trilobites (which were arthropods, as are crabs, insects, and spiders) dominated the seas during the late Cambrian period (540-500 million years ago). Much later, in the late Paleozoic Era, during the Permian period, the Dimetrodons lived. The Dimetrodon is more closely related to us than to the dinosaurs.
 AMMONITE An early mollusk; a fast-moving predatory marine invertebrate. |
 ARCHAEOPTERYX A very early bird; it lived about 150 million years ago. |
 ARCHELON A car-sized marine turtle from the late Cretaceous. |
 CHAMPSOSAURUS A Cretaceous reptile. |
 CRYPTOCLIDUS A large, extinct, swimming reptile from the time of the dinosaurs - a plesiosaur. |
 Desmatosuchus An extinct reptile that lived over 200 million years ago. |
 DIMETRODON An extinct, sail-backed, meat-eating animal from the Permian period (pre-dating the dinosaurs). |
DIMETRODON (Simple version) An extinct, sail-backed, meat-eating animal from the Permian period (pre-dating the dinosaurs). |
 DIMORPHODON A pterosaur with a big head. |
 DOEDICURUS Doedicurus (family glyptodontidae) was an ancient armadillo with a tail mace. It lived during the Ice Ages - long after the dinosaurs died. |
 DSUNGARIPTERUS A pterosaur with an unusual head crest. |
 ERYOPS Eryops was a common, primitive amphibian that lived in swamps during the Permian period. |
 ELASMOSAURUS Elasmosaurus was a huge Cretaceous marine reptile - the largest plesiosaur. |
 ESTEMMENOSUCHUS A large "mammal-like reptile" that lived about 255 million years ago. |
 GERROTHORAX An ancient amphibian that lived over 200 million years ago. |
 GLYPTODON Glyptodon was a car-sized armadillo that lived during the Ice Ages, long after the dinosaurs died. |
HYLONOMUS One of the oldest-known reptiles. |
 ICHTHYORNIS An extinct bird from the time of the dinosaurs. |
 ICHTHYOSAUR Air-breathing marine reptiles with fins. |
 KRONOSAURUS A large Cretaceous marine reptile; a short-necked plesiosaur. |
 LIPOLEURODON Liopleurodon was the biggest plesiosaur. It was a huge swimming reptile that lived over a hundred million years ago, during the Jurassic period. |
 MEGALODON A huge, extinct shark that lived from roughly 25 to 1.6 million years ago, long after the dinosaurs. |
 MOSASAUR Giant marine lizards from the Mesozoic Eras. |
 MOSCHOPS Moschops is an extinct plant-eater that lived before the dinosaurs. |
 NOTHOSAURS Triassic reptiles with flipper-like limbs that lived both on land and in the water. |
PLESIOSAURS Mesozoic marine reptiles. |
 PLESIOSAURUS An extinct, fish-eating marine reptile with four flippers, a plesiosaur. |
 POSTOSUCHUS Postosuchus is an extinct reptile that lived over 200 million years ago. |
 PTERANODON Large, Cretaceous pterosaurs, flying prehistoric reptiles. |
PTERODACTYLS Flying reptiles (a subgroup of pterosaurs) from the Jurassic and Cretaceous. |
PTEROSAUR Flying reptiles from the Mesozoic Era; they were closely related to dinosaurs. |
 QUETZALCOATLUS The largest pterosaur. |
 RHAMPHORHYNCHUS A small pterosaur with a 3.25 feet (1 m) wide wingspan. |
 TERATOSAURUS Teratosaurus was an extinct reptile that lived about 225 million years ago. |
 TRILOBITE Hard-shelled marine animals that lived from the Paleozoic until the late Permian period. |
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