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eurypterus
Eurypterus is often noted as having a short temporal distribution, yet the genus is known to have existed for most of the later stages of the Silurian period for up to some fourteen million years. The oldest fossils are attributed to European deposits while North American fossils are of individuals that lived later in the Silurian. -
stylonurus
Stylonuridae, which lived from the Ordovician to Lower Permian periods, were small to very large forms with scales developing into tubercules and knobs. -
coelophysis
The Coelophysis was a small carnivorous dinosaur whose existance dates back to the Triassic period over 228 million years ago. -
Elliptocephala
Elliptocephala is an extinct genus from a well-known class of fossil marine arthropods -
cryptolithus
Cryptolithus trilobites are a genus of small (less than an inch), blind, trilobites from the Ordovician. -
phacops
can be recognized by its large eyes (which remind some observers of a frog's eyes — the specific name rana is a reference to a common frog), its fairly large size (up to 6 inches long), and its habit of rolling up into a ball like a pill bug. In order to protect themselves from predators, Phacops rana would roll into a ball with its hard exoskeleton on the outside as protection.
