What is "gorgonichthys"

Gorgonichthys clarki is an extinct arthrodire placoderm of the superfamily Dinichthyloidea. Fossils of G. clarki are found in the Upper Famennian Cleveland Shales of Late Devonian Ohio. G. clarki is estimated to have reached 6 meters in length. However it still may not have been as heavily built as its contemporary Dunkleosteus.