What is a parasphenoid?

What is a parasphenoid? Here are some definitions.

  1. (anatomy) A bone situated immediately beneath the sphenoid in the base of the skull in many vertebrates.
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The vomerine, palatine and parasphenoid teeth of all forms are numerous and are not arranged in rows.
Both parasphenoid and basibranchial toothplates, referrable to the Paralbulinae, are known from the site.
The basisphenoid, which is fused with the parasphenoid, also forms a small part of the posteroventral margin of the optic foramen.
It descends toward the parasphenoid and is attached to the prootic.
In order to access the otoliths, the gill arches and flesh covering the parasphenoid bones were first removed.
Two flat elements, presumably the ventral surface of the parasphenoid and a small portion of the vomer, are visible.

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