Hemicyclaspis, armored jawless fish Ankylosaurus especially when the anthropologists' son

especially when the anthropologists' son Richard Leakey suggested it was the first hominin species to use stone tools

5 inches long on the longest side

Grallator is an ichnogenus

Opabinia resembles a crustacean (crusta = hard outer surface or shell)

Hemicyclaspis, armored jawless fish Ankylosaurus especially when the anthropologists' sonHemicyclaspis (meaning half round shield or semicircle plate) is an extinct genus of primitive jawless fish, closely related to Cephalaspis, that lived in the Devonian period in what is now Europe and North America. A typical cephalaspid, Hemicyclaspis had a heavily armored, shovel shaped headshield. It is thought to have been a better swimmer than most of its relatives because of its powerful tail, stabilizing dorsal fin and the keel shaped