Pentecopterus
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Pentecopterus is a genus of eurypterid, an extinct group of aquatic arthropods. Fossils have been registered from the Darriwilian age of the Middle Ordovician period, as early as 467.3 million years a
Pentecopterus decorahensis 1
Life restoration of P. decorahensis.
A pair of P. decorahensis in their habitat illustrated by Patrick J. Lynch.
Megalograptus
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Megalograptus is a genus of eurypterid, an extinct group of aquatic arthropods. Fossils of Megalograptus have been recovered in deposits of Katian age in North America. The genus contains five species
Pentecopterus
…it exceeds all other genera of the Megalograptidae. While fragmentary tergites have been suggested to indicate a length of 2 metres (6 ft 7 in) for Megalograptus shideleri, they actually indicate a length of at most 56 cm (22 in). Most Pentecopterus specimens would have had a total length of 75–100 cm (30–39 in). The large…
Megalograptus ohioensis, Elkhorn Formation
The fragmentary fossil type material of M. alveolatus, originally assigned to the genus Ctenopterus