Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Eugeneodontida is an extinct and poorly known order of bizarre sharks. They possessed a unique "tooth-worl" on the symphysis of the lower jaw as well as pectoral fins supported by long radials. The palatoquadrate was either fused to the skull or reduced. It is possible that they may belong to Holocephali. The subclass Holocephali ("complete heads") is a taxon of cartilaginous fish, of which the order Chimaeriformes is the only surviving group.

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