Tooth morphology and tooth-bearing structures in actinopterygian fish, sharks and rays, and lampreys:
A) a bowfin (Amia calva), B) a mooneye (Hiodon tergisus), C) a sand shark (Odontaspis taurus), D) a parrotfish (Scarus guacamaia), E) a northern pikeminnow (Ptychocheilus oregonensis, and F) a sea lamprey (Petromyzon marinus).