(Of a body part, such as the jaws of a fish) capable of being protruded or extended.
- Therefore, many fish with protrusible jaws have a second set of jaws in the throat, termed pharyngeal jaws, that process food and free the outer jaw to continue feeding.
- These are trapped by the protrusible ciliated feeding tentacles, or lophophore.
- As soon as the whiskers pass over food, the protrusible mouth drops down with an elevator-like motion and rapidly sucks in its meal.
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