Sara has asked us....
What was the largest trilobite?
The largest trilobite was Isotelus rex from the Late Ordovician (ca 450 million years ago) of Manitoba, Canada. A complete specimen is known and it is about 70 cm long and 40 cm wide. It was described by Rudkin et al. in the Journal of Paleontology in 2003.


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More info and pics can be found at
http://www.trilobites.info/lgtrilos.htm
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