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Description
I'll still getting my technique for that poster. These are four devonian placoderms of which the tail and fin anatomy is known. I like Mcnamaraspis the best, as it lived in a reef environment and was similar to predatory lobe finned fish at the time. Coccosteus is a freshwater genus, Dunkleosteus was a open water hypercarnivore, and Holonema seeps to have been an odd bottom feeder. Placodems of the Traverse Group here in Michigan may have been most similar to Mcnamaraspis.

Description
I'll still getting my technique for that poster. These are four devonian placoderms of which the tail and fin anatomy is known. I like Mcnamaraspis the best, as it lived in a reef environment and was similar to predatory lobe finned fish at the time. Coccosteus is a freshwater genus, Dunkleosteus was a open water hypercarnivore, and Holonema seeps to have been an odd bottom feeder. Placodems of the Traverse Group here in Michigan may have been most similar to Mcnamaraspis.