trilobites appeared about 524 million years ago. We found this out by using relative dating (which is comparing the age of two fossils) and the most reliable absolute age (which tells you how old the fossil is by measuring radioactivity. The more radioactivity the older the fossil)
Paleozoic Era
Amphibians are still with us.
Cambrian
Devonian
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Where DID trilobites live? In the ocean, between 530 million and 250 million years ago.
they reproduced asexually
Trilobites appear about 524 million years ago. The "First Appearence Datum" (FAD) of trilobites defines the start of the 2nd Epoch of the Cambrian Period. Trilobites therefore play a very important role in biostratigraphy of the Paleozoic.
The first trilobites appear about the same time in Siberian, Moroccan and North American strata of about 524 million years of age, at the start of series 2 of the Cambrian Period. The first trilobites include fallotaspidoids Profallotaspis, Eofallotaspis, and Fritzaspis, but also include an ellipsocephaloid, Hupetina. For the role of trilobites in biostratigraphy, see this page: http://www.trilobites.info/biostratigraphy.htm
Trilobites were warm blooded creatures that lived in the ocean from the cambrian period all the way until they were wiped out in in the permian period.
Paleozioc
Trilobites became extinct about 250 million years ago, in the Mesozoic Era.
Trilobites lived in the Palaeozoic era, between 300 and 500 million years ago.
The Trilobites.
Trilobites
Trilobites first appeared in the fossil record in the Atdabanian stage of the Early Cambrian period. The fist brachiopods likewise first appeared in the Early Cambrian era.
Three types of marine animals in the Paleozoic Era were trilobites, brachiopods, and archaeocyathids.
Trilobites were associated with the Paleozoic era, from the Cambrian to the Permian.
Trilobites originated during the Cambrian era, flourished through the Paleozoic era, declined during the Devonian era, and finally became extinct in the Permean mass extinction event. In total there were live trilobites on the earth for about 290 million years.
0.2 - 32 inches
The Trilobites was created in 1984.
Trilobites did not have jaws, therefore they could not bite.