Argillochelys cuneiceps is a Homotypic synonym of Chelone cuneiceps (Owen, 1849).
It is one of the more common species of turtle in the London Clay.
Examples of Argillochelys cuneiceps can be seen below:
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https://en.wikipedia.org/wiki/Argillochelys#/media/File:Sheppey_turtles.jpg