Blackwell Publishing
Precambrian Paleozoic Mesozoic Cainozoic
Cambrian 590 MYRBP Ordovician 438 MYRBP Silurian 438 MYRBP Devonian 408 MYRBP Carboniferous 360 MYRBP Permian 286 MYRBP

The trilobites were arthropods, and their hard outer carapace was constructed to allow them to roll up into a ball when threatened - much like a modern woodlouse. They had a variety of lifestyles, some could swim, others ploughed the sea bed in search of food.

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