Dicranurus monstrosus, Trilobite (Replica) Dimetrodon This explains why in some

This explains why in some areas shark teeth are so common

but another type of extinct reptile

Remains of many species are known from North America

Because several regions of the Hunsruck lagerstätte were anoxic

9 metric tons)

Dicranurus monstrosus, Trilobite (Replica) Dimetrodon This explains why in someHere is one of the more sought after trilobites of the Order Lichida, Family Odontopleuridae known as Dicranurus monstrosus. This specimen was found in the Devonian Megrane Formation near Oulmes, Morocco. Among its impressive features are the dramatically retorted occipital spines, looking like ram's horns. To what purpose could this spiny exoskeleton have been evolved? The answer is simple DEFENSE!! Fish had recently evolved jaws, and in the never