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Named By: Henri Marie Ducrotay de Blainville in Blainville in 1818
Time Period: Late Permian
Location: England - Raisby Formation, and Germany - Kupferschiefer Formation
Size: About 30 centimetres long
Diet: Carnivore
Fossil(s): Many individuals
Classification: | Chordata | Osteichthyes | Actinopterygii | Palaeonisciformes |
Also known as: | Palaeoniscus |

Palaeoniscum is an extinct genus of ray-finned fish from the Permian period of Europe and North America.

Palaeoniscum had a torpedo-shaped body 30 centimetres (12 in) in length, with a deeply forked caudal fin and tall dorsal fin, indicating that it was a fast swimmer. It was probably an active predator, feeding on other fresh water fish. Its sharp teeth could be replaced when lost, a trait also seen in modern day sharks. Like other early ray-finned fish, Palaeoniscum had air sacs connected to the mouth which served as a primitive swim bladder.

Read more about Palaeoniscum at Wikipedia
PaleoCodex is a weekend hack by Saurav Mohapatra