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Figure 9a. Cambrian Ptychopariid Trilobite

Glyphaspis capella, a middle Cambrian ptychopariid trilobite from the Conasauga Formation, approximately 1.6 inches (4.2 centimeters) long. Ptychopariids were among the most common trilobites in the Cambrian and also the longest-surviving group through the Paleozoic Era.
Photo courtesy of David R. Schwimmer Ⓒ 2017