Jawless Fish (Cyathaspidida)

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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 particular specimen displays two pieces of the armored plates of Americaspis. 

Jawless Fish (cyathaspids)
Americaspis americana
Silurian
Wills Creek Formation
Perry Co., Pennsylvania

 

Size (of whole plate): 2.75 x 2 x 1.25 inches

Size (of specimens): ~ 1.5 x 1 inches

Weight: 6.6 oz.