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Phacops rana milleri
© 1998 Dr. Richard Paselk, Humboldt State University Natural History Museum
Trimurus delphinocephalus on Eospirifer eudora
© 2005 Falls of the Ohio State Park
© 2005 The Virtual Fossil Museum
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 lobestwo 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.
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