Gourt > Science > Earth Sciences > Paleontology > Invertebrates > Arthropods > Trilobites
Trilobites are extinct arthropods in the class Trilobita. They appeared in the Cambrian period and flourished throughout the lower Paleozoic era before slowly declining to extinction. The last of the trilobites disappeared in the mass extinction at the end of the Permian 250 million years ago (m.y.a.).
Trilobites are very well-known, and possibly the second-most famous fossil group after the dinosaurs. They are the most diverse group of animal species preserved in the fossil record, consisting of nine (or possibly ten) orders and over 15,000 species.
Most were simple, small marine creatures that filtered mud to obtain food.
Physical description
SamGonIII_3lobes.png The bodies of trilobites are divided into three parts (tagmata): a cephalon (head), composed of the two preoral and first four postoral segments completely fused together; a thorax composed of freely articulating segments; and a pygidium (tail) composed of the last few segments fused together with the telson. In the most primitive trilobites the pygidia are still fairly rudimentary. The thorax is fairly flexible—fossilised trilobites are often found curled up like modern woodlice for protection. More on [ Trilobite ]
Paleozoic :: By Geological Interval
Permian Triassic :: Extinction
@pin2d2 .e00 es como un trilobites
MarcoTVS (Marco T. Villegas) Fri, 06 Nov 2009 21:17:44 -0000
@pin2d2 .e00 es como un trilobites
I wonder if trilobites would have been a tasty dish. Failing that, would they have been good aquarium pets?
scasher (S. C. Asher) Wed, 04 Nov 2009 22:25:26 -0000
I wonder if trilobites would have been a tasty dish. Failing that, would they have been good aquarium pets?
Puce? RT @goodhen: Quick poll: What colour were trilobites?
genzaichi (nikki pugh) Wed, 04 Nov 2009 13:14:19 -0000
Puce? RT @goodhen: Quick poll: What colour were trilobites?
Quick poll: What colour were trilobites?
goodhen (Helen Goodchild) Wed, 04 Nov 2009 13:10:05 -0000
Quick poll: What colour were trilobites?
Your momma so old she doesn't have crabs...she has trilobites.
JackrabbitZERo (Michael Vargo) Tue, 03 Nov 2009 19:02:51 -0000
Your momma so old she doesn't have crabs...she has trilobites.
#unseenprequels Paleozoic Park: The Trouble with Trilobites
davidscohen (David Cohen) Tue, 03 Nov 2009 01:24:11 -0000
#unseenprequels Paleozoic Park: The Trouble with Trilobites
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Guide to the Orders of Trilobites - Excellent resource for understanding trilobites, with pictures, diagrams, a glossary, and links.
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Among My Trilobites - Photographs of a personal trilobite collection with maps of the Paleozoic eras they came from highlighting the areas where they lived.
Cincinnatian Trilobites - Information about trilobites from the Upper Ordovician Period Cincinnatian Seiries of Eastern North America. Includes images and links.
Meta Description: [ Welcome to Cincipaleo. Please enjoy images of Cincinnatian trilobites and other specimen. ]
Introduction to the Trilobita - UCMP Berkeley introduction to the trilobite fossil record, ecology, systematics and morphology.
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Mr.B.Bug's Trilobite World - An entertaining and informative approach to the subject of trilobites and trilobite fossils, with animated graphics and audio.
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Palaeontology - Research - What are Trilobites? - A short intro to trilobites, courtesy of the Australian Museum Online.
Meta Description: [ Trilobites are an extinct group of arthropods (jointed-legged animals) known from more than 10,000 fossil species. The group Trilobita existed from early in the Cambrian Period (525 million years ago) until the end of the Permian Period (250 million years ago). ]
Per Hansson's trilobite gallery - Swedish trilobites.
Meta Description: [ Per Hanssonīs Trilobite Gallery. Here is a catalouge of my trilobites from Sweden.trilobite, trilobites, trilobiter, trilobit, trilobiti, fossil ]
The Semi-Compleat Trilobite - A page of trilobites with images broken down by time period.
Trilobites - Photographs of trilobites that can be found in Millard County, Utah.
Meta Description: [ A Rock hounds paradise is Millard County, Utah ]
Trilobites - Photos of trilobites from around the world, as well as a searchable database of over 280 specimens.
Trilobites - Utah Geological Survey - Trilobites and the Cambrian Environment of Utah, an essay by Rebecca L. Hylland.
Meta Description: [ The Utah Geological Survey investigates and reports on Utah's geologic hazards, mineral, energy, water, and paleontological resources, maps the state's geology, and provides geologic and topographic information. ]
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Trilobites and their Evolution Through Time - Trilobite evolution, morphology and extinction. Includes information on the use of trilobites as paleoenvironmental and stratigraphic tools.
Meta Description: [ Document not found ]
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Virtual Wonders: Trilobites - The Natural History Museum's online exhibit of several bizarre trilobite taxa from Morocco, including three dimensional views of new specimens.
Weeks formation and Indiana Trilobites - Images of and information about a personal collection of well-preserved trilobites found in Indiana and the Weeks Formation of Millard County, Utah and Indiana.
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