Which bones make up the Weberian apparatus?

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knifefish — ostariophysan Knifefish, or featherback (Xenomystus nigri)

The Weberian apparatus is a specialized structure found in the superorder Ostariophysi that functions to enhance hearing. It is composed of four pairs of small bones, known as ossicles, which are derived from the vertebrae located immediately behind the skull.1

These bones create a mechanical link between the swim bladder and the inner ear, allowing the fish to detect pressure changes from sound waves.1