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Titanichthys was, as it's name hints, a titan from the late Devonian period. It was about the size of Dunkleosteus, which is at least 8 metres long, although the actual size is unkown. it would probably have fed on Squid, fish and smaller placoderms like: Coccosteus, Bothriolepis and maybe even young Dunkleosteus. The fish could also have been a cannibal, eating younger Titanichthys.