User blog comment:Sealmoshi/More things they should add to this mod/@comment-6040659-20150814191921/@comment-25118285-20150927164613

http://blogs.scientificamerican.com/running-ponies/prehistoric-ghost-shark-helicoprions-spiral-toothed-jaw-explained/

Helicoprion's jaw was figured out and does not look like that. The jaw on that model was based on older information.

Also, look at the second picture in that link, I find all the old ideas quite funny :p