Trilobites (meaning "three lobes") are a well-known fossil group of extinct marine arthropods that form the class Trilobita. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period (526 million years ago) and flourished throughout the lower Paleozoic era before beginning a drawn-out decline to extinction when, during the Devonian, all trilobite orders, with the sole exception of Proetida, died out. Trilobites finally disappeared in the mass extinction at the end of the Permian about 250 million years ago.
When trilobites first appeared in the fossil record they were already highly diverse and geographically dispersed. Because trilobites had wide diversity and an easily fossilized exoskeleton an extensive fossil record was left, with some 17,000 known species spanning Paleozoic time.
A Trilobite is a fossil. The fossilised remains of a type of animal called an arthropod that lived in the sea between 521 and 250 million years ago. They are now extinct.
They are called "trilobites" because their body shapes have 3 lobes. They looked a bot like woodlice.
I have made a link to a picture of a trilobite below.
Ancestors of trilobites would be arthropods in the same broad group to which trilobites belong (the Arachnomorpha) but lacking one or more of the characteristics that distinguish trilobites. Perhaps one of the most important trilobite characteristic feature is exoskeleton calcification. Without a calcified skeleton, the chances of fossilization are extremely low. This may explain why the ancestors of trilobites are not clearly known. Arachnomorph groups such as the Helmetiidae, Naraoiidae, Tegopeltidae, and Xandarellidae might resemble the ancestors of trilobites. Each of these is uncalcified, and only rarely preserved, as at the Burgess Shale in Canada and Chengjiang, in China.
index fossils
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.
arthropods
The Trilobites was created in 1984.
Trilobites did not have jaws, therefore they could not bite.
Trilobites are extinct but they were marine animals.
Scientists believe that trilobites reproduced sexually. These prehistoric and extinct creatures were a type of arthropod that probably laid eggs. Trilobites lived about 250 million years ago.
Where DID trilobites live? In the ocean, between 530 million and 250 million years ago.
Trilobites became extinct about 250 million years ago, in the Mesozoic Era.
The first trilobites lived in the Cambrian then lived all the way through the permian
Trilobites
Arthropods
What does reproduction mean
Trilobites have been extinct for a long time; there are none left for us to take care of.