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Trilobites of the World

Posted by David Penney on

Trilobites are one of the most fascinating groups of extinct marine arthropods, known for their distinctive appearance and incredible diversity. These creatures first appeared during the Early Cambrian period, more than 500 million years ago, and went on to dominate the seas for millions of years before ultimately becoming extinct at the end of the Permian period.

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Trilobites were characterized by a hard exoskeleton that covered their entire body and was divided into three distinct parts - the cephalon (head), thorax (midsection), and pygidium (tail). Their unique segmented bodies made them incredibly agile and allowed them to adapt to a wide range of ecological niches.

Trilobites were incredibly diverse, with more than 20,000 known species identified to date. They ranged in size from just a few millimeters to over 70 centimeters in length and could be found in virtually every ocean around the world.

One of the most famous trilobite species is the Phacops rana, which lived during the Devonian period and is known for its distinctive compound eyes. These eyes, which were made up of hundreds of individual lenses, are considered to be among the most advanced visual systems of any animal that lived during the Paleozoic era.

Another notable trilobite species is the Isotelus rex, which lived during the Ordovician period and was one of the largest trilobites ever to have existed. With a length of up to 70 centimeters, it was a formidable predator that likely fed on a wide range of smaller marine creatures.

Trilobites have been found in fossil deposits all over the world, with some of the most notable sites located in North America, Europe, and Asia. In the United States, the Wheeler Shale formation in Utah is a particularly rich source of well-preserved trilobite fossils, as is the Mazon Creek fossil beds in Illinois. In Europe, the famous Burgess Shale formation in Canada has also yielded an incredible diversity of trilobite species, along with other remarkable fossils.

The study of trilobites has provided valuable insights into the evolution of life on Earth and the ancient seas that these creatures once called home. Their fossils are prized by collectors and researchers alike, and continue to fascinate and inspire those who study the natural world.

In conclusion, trilobites were an incredibly diverse and adaptable group of marine arthropods that lived for millions of years and left a lasting mark on the history of life on Earth. Their fossils are found all over the world and continue to captivate the imagination of scientists and enthusiasts alike. Many of them are beautifully illustrated in our series of books on the topic. Click any of the cover images above to see more.

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