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1. Moray eels
   Eels masquerading as snakes sounds interesting, and that is before they go hunting with their friends the groupers...  

2. Pharyngeal jaws in teleost fish
   One of the great evolutionary breakthroughs in the teleost fish was the conversion of some of the elements that supported the gill bars into a second set of pharyngeal teeth that complemented the oral teeth. See how a fish becomes a snake!