"blasisaurus" is a medium-sized euornithopod. the describers have been able to identify two distinct features: the cheekbone has a rear projection with a hook-shaped upper edge, and the lower sleep window is narrow and d-shaped. from the same formation is "arenysaurus", a related species. they are not identical, distinguished by the shape of the teeth and missing secondary ridges. "blasisaurus" also differs from "koutalisaurus" by a downwardly bent front edge of the lower jaws.