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(74 total)
Gravicalymene
© 2001 Richard Schrantz
Isotelus iowensis
© 2003 Gary Andrashko, Illinois State Museum
Arctinurus boltoni
© 2005 The Virtual Fossil Museum
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What are Trilobites? Trilobites are perhaps the most famous and easily recognized fossil invertebrate group. The name comes from the length wise division of the body into three lobes—two side (pleural) lobes separated by one central (axial) lobe. All trilobites had antennae and legs with two branches, one used for locomotion and the other for respiration. Some had compound eyes, like a modern fly. Trilobites were strictly marine animals, but they were very diverse, living in both shallow and deep waters. First known fossil occurrence: Cambrian. Last known fossil occurrence: Permian. Cool Trilobites links: Search for images of Trilobites on Google |
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