Real-world inspiration for mobile vertebrate jaw configurations, especially "splitting" and laterally closing jaws. Click on images for attribution links.
Northern Right Whale skull:
Southern Right Whale skull:
Reticulated Python jaws:
Everted mouth flaps of the agamid lizard Phrynocephalus mystaceus:
Sarcastic Fringehead threat display:
Pharyngeal jaws (moray eel):
Stoplight Loosejaw:
The protrusible jaws of teleosts generally are informative and inspiring, though I'm having trouble finding a diagram at decent image size.
https://s3.amazonaws.com/classconnection/480/flashcards/3239480/png/teleost-150C9BA3A315098F954-thumb400.png
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