Function
The branchial system is typically used for respiration and/or feeding. Many fish have modified posterior gill arches into pharyngeal jaws, often equipped with specialized pharyngeal teeth for handling particular prey items (long, sharp teeth in carnivorous moray eels compared to broad, crushing teeth in durophagous black carp). In amphibians and reptiles, the hyoid arch is modified for similar reasons. It is often used in buccal pumping and often plays a role in tongue protusion for prey capture. In species with highly specialized ballistic tongue movements such as chameleons or some plethodontid salamanders, the hyoid system is highly modified for this purpose, while it is often hypertrophied in species which use suction feeding. Species such as snakes and monitor lizards, whose tongue has evolved into a purely sensory organ, often have very reduced hyoid systems.
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