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Trilobites

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(74 total)

Olenellus fremonti
Olenellus fremonti
© 2004 UCMP

Ptychagnostus richmondensis
Ptychagnostus richmondensis
© 2005 The Virtual Fossil Museum

Coronura aspectens (Conrad)
Coronura aspectens (Conrad)
© 2005 Falls of the Ohio State Park

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.

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See Trilobites from the:

Quaternary
Tertiary
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
Precambrian
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