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Echioceras

Echioceras had an evolute shell, which probably made it a slow swimmer. It had thick, straight radial ribs that terminated at the ventral keel. This Lower Jurassic ammonite has been found worldwide.

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Image by Hectonichus, licensed under CC BY-SA 3.0 Unported and GFDL, Image by Hectonichus, licensed under CC BY-SA 3.0 Unported and GFDL, https://commons.wikimedia.org/wiki/File:Echioceratidae_-_Echioceras_raricostatum.JPG
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Special thanks to the Science Museum of Minnesota for aiding this project.

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