cephalaspis (meaning "head shield") is a probably monotypic genus of extinct osteostracan agnathan vertebrate. it was a trout-sized detritivorous fish that lived in estuaries of the early devonian - agnathan stock illustrationsCephalaspis (meaning "head shield") is a probably monotypic genus of extinct osteostracan agnathan vertebrate. It was a trout-sized detritivorous fish that lived in estuaries of the early DevonianFossil, Ancient, Devonian
