Palaeospinax is an extinct genus of synechodontiform cartilaginous fish.

Although several species have been described, the genus is considered nomen dubium because the type-specimen of the type species, Palaeospinax priscus, from the Late Triassic-Early Jurassic of Europe lacks appropriate diagnostic characters to define the genus.

[5] Other species originally described as Synechodus were transferred to the genus Palidiplospinax.

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