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Temporal range: 418–409 Ma
Ishnacanthus gracilis.JPG
Ischnacanthus gracilis
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Class: Acanthodii (J. A. Long 2011)
Order: Ischnacanthiformes

Ischanacanthiformes is an order of Acanthodii or spiny sharks found in Canada, Ukraine and United Kingdom. Members of this order were nektonic carnivores,[1] eating animals that swim rather than plankton. They had slender builds, light armor, deeply inserted spines, shark-like teeth, and two dorsal fins.[1] Some species were around 2 meters (6.56 feet) long.[2] It was described by Berg in 1940.[3][4]


  1. ^ a b McGraw-Hill Dictionary of Scientific & Technical Terms (6 ed.). McGraw-Hill Companies, Inc. 2003.
  2. ^ "Palaeos Vertebrates Acanthodii: Teleostomi". Retrieved 2018-09-30.
  3. ^ "†order Ischnacanthiformes Berg 1940 (spiny fish)". Fossilworks. Retrieved 11 January 2014.
  4. ^ Burrow, Carole. Acanthodians with dentigerous jaws: the Ischnacanthiformes and Acanthodopsis. Department of Zoology and Entomology, University of Queensland.