The Cameroceras is the first of the large Mollusks that predated Squids. It appears in Dangeroues Seas.
The Cameroceras had a large cone that took up more than half it's body in length. It had short tentacles unlike it's successor and was the largest predator during the Ordivician Period.
It appears during Nigel's dive into the sea in attemps to lure out larger creatures. It ends up killing two Megalograptus and swims into deeper waters.
- In the episode Nigel said it was heading for deeper waters. That however would've killed it in reality.