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a life size model of a megalodon
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The Model Megalodon

 Take a trip to the National Museum of Natural History in Washington, D.C. and you...
many different trilobites
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Trilobite Shapes

 Prolific survivors with a segmented body plan that could be easily modified and...
a fossil of an ancient arthropod
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The Lace Crab

 Marella splendens was an arthropod that lived during the Cambrian Period. It is the...
a fossilized opabinia
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The Burgess Shale

 This creature with its five eyes is a strange looking one indeed. Wielding a long...
several marine reptiles swim in the shallows
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Triassic Shallows

 Many marine reptiles from the Triassic Period look like large, scaly newts. Here,...
a reef scene with fish and large "sea scorpions"
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A Silurian Reef

 The eurypterids, a group of arthropods, were some of the most fearsome predators...