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Description
Eurhinosaurus longirostris again. This one came before the other version I've shown, qilong.deviantart.com/art/What… , but had some problems that I've corrected to produce the "open mouth, closed mouth" pair. Some details differ between the two, but this gives you an idea how the jaws differ in size so extremely when the jaw is opened. The thing is, the retroarticular process is long, and implies the jaw could open much wider, and that seems an adaptation for ram-suction, much like modern billfish (marlin, swordfish, sailfish, etc.). so this would be a potential high-speed pelagic all-around consumer. The teeth may have been functional, but only as far as the mandible, for eating; the rest, may have been used for almost anything.

Description
Eurhinosaurus longirostris again. This one came before the other version I've shown, qilong.deviantart.com/art/What… , but had some problems that I've corrected to produce the "open mouth, closed mouth" pair. Some details differ between the two, but this gives you an idea how the jaws differ in size so extremely when the jaw is opened. The thing is, the retroarticular process is long, and implies the jaw could open much wider, and that seems an adaptation for ram-suction, much like modern billfish (marlin, swordfish, sailfish, etc.). so this would be a potential high-speed pelagic all-around consumer. The teeth may have been functional, but only as far as the mandible, for eating; the rest, may have been used for almost anything.