Trilobite

Wisconsin State Fossil

WisonsinTrilobiteCalymene-celebra.jpg

Trilobite (Calymene celebra)

Trilobite (Calymene celebra); photo by Jim Brace-Thompson / American Federation of Mineralogical Societies (all rights reserved; used by permission). 

Trilobite

Wisconsin designated the trilobite (Calymene celebra) as official state fossil in 1985. Related to modern day crabs, lobsters, shrimp, spiders, and insects, this extinct marine arthropod flourished in shallow prehistoric salt waters during the early to middle Paleozoic age.

Like modern arthropods, they had to periodically molt their shells to grow, so one trilobite could have left a dozen or more shed carapaces to fossilize.

Wisconsin

Images

An exceptionally well-preserved trilobite with antennæ and legs - photo by Smith609 on Wikipedia - published under terms of the GNU Free Documentation license version 1.2 or later.
See All State Fossils & Dinosaurs.

Videos

David.Attenboroughs.First.Life.Trilobites.avi (V.O.S.)

Introduction to Trilobites pt .1 of 2