Cyathaspidida are spindle-shaped extinct fish that lived near or in the bottom of the ocean floor roughly 420 million years ago. These interesting creatures were completely protected by armored plates, including a scaled tail.
This specimen shows one piece of the armored plates of Americaspis.
Type: Jawless Fish (cyathaspids) Species: Americaspis americana Age: Silurian (443 - 416 million years ago) Formation: Wills Creek Formation Locality: Perry Co., Pennsylvania
