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Promicroceras

Promicroceras was not as common as Asteroceras (a larger ammonite it shared its habitat with). Promicroceras had a slightly evolute shell and large, distinct radial ribs that expanded out along the venter. This Lower Jurassic genus had a global distribution.

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Image by Ammojoe, CC BY-SA 3.0 Unported, https://commons.wikimedia.org/wiki/File:Promicroceras_pyritosum.JPG
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