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Ichthyosaur

Ichthyosaurs were giant marine reptiles that resemble a dolphin with large teeth.

They lived during a large part of the Mesozoic era, and appeared about 250 million years ago (Ma), slightly earlier than the dinosaurs (230 Ma); and disappeared about 90 Ma, about 25 million years before the dinosaurs became extinct.

Note:   The above text is excerpted from the Wikipedia article "Ichthyosaur", which has been released under the GNU Free Documentation License.
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August 1, 2015

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