I did a quick sculpt of a head idea I've been sketching... I still can't figure out exactly how her mouth would look open... when it's closed it looks like >'< or x with a little line. The basic idea is that she has a complex outer jaw and a simple pharyngial jaw. Not exactly sure of the configuration that would lead to 5 lip flaps... but she has them. 5 nostrils too
The pharyngial jaw opens normally... well as normal as a secondary jaw can open. The eyes can fold against the head for binocular or trinocular vision or move independently for 360' peripheral vision.