Trilobite
Related Category: Zoology: Invertebrates
(tr´lbt´´), subphylum of the phylum Arthropoda that includes a large group of extinct marine animals that were abundant in the Paleozoic era.
Trilobites
Palaeontologists have identified more than 20,000 different trilobites, an amazingly diverse group of animals.
TRILOBITE
Trilobites were early invertebrates with a segmented body and an exoskeleton. Trilobites dominated the environment during the Cambrian Period (540 to 500 mya).
The Trilobites are known only as fossils, mostly Silurian and prae-Silurian; a few are found in Carboniferous and Permian strata. As many as two thousand species are known.
Right: Fossil trilobites
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Ordovician period: (505 million years ago)
The first nautiloids appeared. Corals and trilobites were common.
Yes, orgies of trilobites caught in the act.
Shar-Peis' New Wrinkle: Skin Gene Also Can Make Them Sick
The fever disorder is related to a human disease, and this knowledge might help develop new therapies and treatments.
pleurae -- In trilobites and other arthropods, pleurae are elongated flat outgrowths from each body segment, that overlie and protect the appendages.
pore -- Any opening into or through a tissue or body structure.
Trace fossil: trilobite tracks
Trace fossils
Traceological analysis of flakes from the Neolithic site Imchin II on Northern Sakhalin
Tracing the diversity of stone tools assemblages in West New Britain, Papua New Guinea ...
Trilobites disappeared about 225 million years ago during the Permian Period. The reason for their extinction is not known. The first land animal was a myriapod arthropod.
Algae and sponges, as well as the fossilized remains of many echinoids, brachiopods, bivalves, gastropods, and trilobites that lived on the reefs help to build them.
The horseshoe crab is not a 'true crab' (it's not a crustacean), but is grouped with scorpions, spiders, and extinct trilobites.
Since life began on our planet, about 99 percent of all species that ever lived have gone extinct-most of them due to natural causes. Extinct are the tyrannosaurus rex, the woolly rhinoceros, the mastodon, the trilobite, and the saber-toothed tiger.
 See also: Dinosaur, Crustacean, Arachnid, Whale, Spider
  
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