It is V-shaped with the central parts representing the basihyal and basibranchial, and the branches being the ceratobranchialia.
2.
At the same time, the well-developed basihyal ( analogous to a tongue ) on the floor of the mouth drops, expanding the oral cavity and sucking in water and prey.
3.
Instead, the hyomandibular cartilages provide the only means of jaw support, while the ceratohyal and basihyal elements articulate with the lower jaw, but are disconnected from the rest of the hyoid.
4.
The shark first secures itself to the body surface of its prey by closing its spiracles and retracting its basihyal ( tongue ) to create pressure lower than that of the surroundings; its suctorial lips ensure a tight seal.
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