Phacops rana is a species of trilobite from the middle Devonian period. Phacops rana and its related genus can be recognized by its large eyes (which remind some observers of a frog's eyes — the specific name rana is a reference to a common frog), its fairly large size (up to 6 inches long), and its habit of rolling up into a ball like a pill bug.
- Wikipedia, The Free Encyclopedia. 5 January, 2012. “Phacops rana". Retrieved January 11, 2012 from http://en.wikipedia.org/wiki/Phacops_rana
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