Now that's what I call jaws!
cue the music...LOL.
Looks like some of the bizarre deep sea fish but luckily those are much smaller.
...As far as we know............
The deep sea is cold and things grow slowly - giant squid and the Greenland Shark take centuries to grow big eg:- a female Greenland Shark probably doesn't mature enough to start reproducing until about 156 years old on our latest best data.
Not saying that there aren't some big things down in the deep sea that we haven't seen yet but it's far easier down there to grow slow, stay small and eke out an existence on what little is available.
And just to be funny the bigger squids only operate in the cold depths because most of their warm water adapted cousins were hunted more or less to extinction by whales and sharks of various kinds. Moreover whales evolved layers of insulating blubber against the cold when their ancestors were being hunted by giant carnivorous slim whales and horrifically big sharks and headed into the cold around the poles for safety.
I'm oversimplifying of course but I'm saying that there is a reason why deep sea life is scant and mostly small due to the cold, the pressure and the lack of resources.
Wow, that set of comments was awesome Bob, and thanks! I totally agree with you.
On Whoomera, the seas are shallow, warm, and fresh water. And like our dinosaurs, I think size is a means of competing.