Ischnacanthiformes
| Ischnacanthiformes Temporal range: 418–409 Ma |
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| Ishnacanthus gracilis | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Subphylum: | Vertebrata |
| Infraphylum: | Gnathostomata |
| Class: | Acanthodii (J. A. Long 2011) |
| Order: | Ischnacanthiformes |
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Ischanacanthiformes is an order of Acanthodii or spiny sharks found in Ukraine and United Kingdom. Members of this order were nektonic carnivores, eating animals that swim rather than plankton. They had slender builds, light armor, deeply inserted spines, and two dorsal fins. It was described by Berg in 1940.
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