"Eastmanosteus" differs from "Dunkleosteus" in having a unique tubercle-ornamentation on the dermal surfaces of the plates, a distinctively shaped nuchal plate, and sutures that are more zigzagging.The best studied species, "E. calliaspis" may not be of this genus due to its recently appreciated relationship to the Emsian-aged genus "Xiangshuiosteus".