Anvil shark
The stecanthus or anvil shark was an ancient shark which lived 360 – 340 million years ago
They had strange anvil shaped dorsal fin. On these were small spike shaped hair
These fins are found only on males giving theories like maybe these were for the mating season
They are quite small and only 70 centimeters in length
Dunkleosteus
The dunkleosteus was the first large and apex predator on earth
It lived about 352 – 358 million years ago
A special fact is that despite having no teeth it could still bite as their armor on their faces also evolved into teeth
They ate fish, sharks and other dunkleosteus
Buzzsaw shark
The heliocopron or the buzz saw shark was an ancient shark which lived 280 years ago
They have their lower jaw in a circular shape covered in teeth like a buzzsaw
They ate fish and squids
Many sharks have their teeth break off and again regrow to stay alive, this shark was the first to evolve that ability
Mosasaurus
The mosasaurus was a type of the family mosasaurs existing 82 – 66 million years ago
They ate sharks, bony fish, birds, squids and octopi, other Mosasaurus and turtles
Their max size is 17 meters
They were ambush hunters, teaching their young how to hunt
