Amylodon eocenica was an early Eocene chimaeroid, a holocephalan relative of living ratfishes and long nosed chimaeras rather than a shark or ray. Its rhinochimaerid placement provides the best guide to its general body plan, while the known fossils are mainly dental plates. Chimaeroids do not continually replace rows of individual teeth; instead they possess persistent plates that grow with the animal and contain dense tritor tissue.

Those tooth plates formed durable crushing and shearing surfaces. They indicate feeding on resistant food and make a demersal diet including hard bodied invertebrates a reasonable functional inference, although the exact prey of A. eocenica is not known directly. The plates record a specialised feeding system very different from the piercing dentitions of the lamniform sharks that lived alongside Palaeogene chimaeroids.