tripus
The hindmost Weberian ossicle of the Weberian apparatus, touching the anterior wall of the swimbladder and connected to the intercalarium by a dense, elongate ligament.
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Ichthyological terms, not general ones.
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Weberian ossicle
Any of the modified vertebrae comprising the Weberian apparatus in Ostariophysian fishes, individually named the claustrum, scaphium, intercalarium and tripus.