The prehistoric armored fish, Pterichthys milleri.

Pterichthys Milleri

The prehistoric armored fish, Pterichthys milleri.

Pterichthys Milleri (sea scorpion), an armored fish of the Devonian period.

Pterichthys Milleri

Pterichthys Milleri (sea scorpion), an armored fish of the Devonian period.