Post oddities that have since left this earth.
Starting with this guy, who has an anvil on his head with spikes on it because why not.
>Reconstructions of Helicoprion since 1899. Earliest models (a–d) posited the whorl as an external defensive structure, but (e–l) feeding reconstructions dominate more recent hypotheses. Credits: (a) Woodward ; (b) Simoens ; (c) Karpinsky ; (d) Obruchev ; (e) Van den Berg in Obruchev ; (f) John ; (g) Carr ; (h) Eaton ; (i) Parrish in Purdy ; (j) Troll in Matsen & Troll  based on Bendix-Almgreen ; (k) Lebedev ; (l) Troll & Ramsay, this study. Configuration of gill slits and fins based on related fish, e.g. Caseodus and Ornithoprion .
I've read a hypothesis that heliocoprion's jaw shape is literally ideal for slashing through flesh the curved shape maximizes damage at the focal point of the curve. Heliocoprion lived at a time that coincided with the first fossilized giant squid remains. Giant squid are made entirely of flesh...
I like the think it was more like purdy and parrish or richard ellis. with the teeth deeper in, maybe two spirals.
Karpinsky stuff just seems nonsense.
Another one i wonder about is them being horizontal in the mouth, kinda like alex broadbent, but with a shark. Mostly everything looks vertical.
The goofy lower outer jaw stuff, though, may be good for bottom feeding if the shark wants to dig through the bottom for food.
you are like a little baby watch this METO
Wikipedia doesn't have anything on this guy and google results are shit too, do you have any links explaining the two mouths or know yourself? I'm really curious about this freaky fish now.
>heroes in a half shell
Before we had the skull shown in >>2295406, lit all we had to go on for trying to imagine what the animal looked like was that central whorl of teeth. People guessed it was probably something shark-like based on the teeth and whatnot but that's as good as we could do.
All those pictures are what different researchers have proposed for the placement of the tooth whorl in something shark-like.