Pterichthyodes milleri, Placoderm Pachycephalosaurus human hunting was likely a

human hunting was likely a strong contributing factor

The curve of the shell is easy to see

5 million years ago having existed for approximately 11

4 inches high

The name means "underworld"

Pterichthyodes milleri, Placoderm Pachycephalosaurus human hunting was likely aPterichthyodes is a genus of antiarch placoderm fishes from the Devonian period. Its fossils have been discovered in Sandwich Fish Beds of Ouoyloo, Orkney Islands, Scotland. They were one of the first species recognized for what they were, as their fossils are common in the Old Red Sandstone formation studied by geologists in the early 19th century. Due to their extreme divergence from modern day fish, they were a puzzle unsolved until Charles Darwin