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4 inches high
The name means "underworld"
dense and compact bones (penguins show a similar bone profile in cross section)
was a strange somewhat scorpion-like animal
had an oval outline
Pterichthyodes milleri, Placoderm Pachycephalosaurus 4 inches highPterichthyodes 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
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