Some Lamniformes I been worked on recently:
Carcharodon hastalis(8-9m);Otodus chubutensis(~14m);Otodus megalodon(~18m) and Carcharodon carcharias(6m)
-with more coming soon...

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Even within the small order of Mackerel (aka of Prey") there is an incredible variation in their sizes...

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Did you guess that shark?
CRUNCH, the Crocodile Shark, is our newest shark friend!

The Crocodile shark is the only living species in their family. And they are the smallest species the Lamniformes Order (Mackerel Sharks).

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Something akin to these is more likely
Here is a life restoration along with a few muscle studies based on multiple lamniformes using the craniums and jaws shared, used thresher/lamna as ref for one and crocodile sharks for the other
I should probably make a mako ref

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For the fin anatomy the pectoral fins of lamniformes is more like this (these belong to a megamouth specifically)
And here is a diagram of how the skeletal anatomy of the gill arches should be

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