Cameroceras

Cameroceras was a huge mollusc from the Ordovician period. It was the top predatos in the water at that time.

Description
Cameroceras was a long, streamlined mollusc. It is famous for its long, cone-shaped shell used for defence.

Shell
The shell was used for protection. Though it was top predator it was shelled just like the rest of mollusks of its time (the snails, the bivalves, etc.).

Hunting tactics
Cameroceras hunted sea scorpions, trilobites, jawless fish (agnaths) and so on. They moved like modern squids via jet propulsion and snatched their prey quicky with their tentacles, that, however, had lacked suckers, but was grooved instead. The beak ground the prey into pieces just like the modern day cephalopods.

Weaknesses
These creatures spent a lot of time in deep water. Light didn’t penetrate too well down there so their eyesight was poor and they relied on another sense: they would actually smell out their prey and then crush it to bits.

Compared to the modern cephalopod mollusks, though, Cameroceras had smaller eyes and was less active than the modern squid, and still possessed an external shell. They died out at the end of the Ordovician period, when more advanced sea scorpions had outcompeted it as top predators.

The Seventh Most Deadliest Sea
One came and ate the "Trilobite Cam" that Nigel Marven set up in order to record life in the Ordovician sea. Nigel followed the camera cord to find the Cameroceras. It was curious of Nigel but for his own protection, he flashed a torch in its eyes to repel it. The Cameroceras later ate some Megalograptus and swam away.

Water Dwellers
Cameroceras made a small cameo.

Errors

 * In Walking with Monsters, Cameroceras was shown living in the Silurian. Cameroceras died out at the end of the Ordovician.