Palaeospinax
| Palaeospinax Temporal range:  | |
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| Scientific classification | |
| Domain: | Eukaryota | 
| Kingdom: | Animalia | 
| Phylum: | Chordata | 
| Class: | Chondrichthyes | 
| Subclass: | Elasmobranchii | 
| Order: | †Synechodontiformes | 
| Family: | †Palaeospinacidae | 
| Genus: | †Palaeospinax Egerton, 1872 | 
| Type species | |
| †Paleospinax priscus Agassiz 1843 | |
| Species | |
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| Synonyms | |
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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.
Other species originally described as Synechodus were transferred to the genus Palidiplospinax.