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meaning: "Hand scale"
Named By: Louis Agassiz in 1835/1843
Time Period: Middle Devonian-Late Devonian
Location: Belarus, Canada, Germany, Hungary, Kazakstan, Mexico, Poland, Russia, Scotland and the USA
Size: About 55 centimetres long, some variation between species
Diet: Piscivore/Carnivore
Fossil(s): Multiple specimens of varying levels of completeness
Classification: | Chordata | Actinopterygii | Cheirolepiformes | Cheirolepidae |

Cheirolepis ('hand fin') is an extinct genus of ray-finned fish that lived in the Devonian period of Europe and North America. It is the only genus yet known within the family Cheirolepidae and the order Cheirolepiformes. It was among the most basal of the Devonian actinopterygians and is considered the first to possess the "standard" dermal cranial bones seen in later actinopterygians.

Cheirolepis was a predatory freshwater fish about 55 centimetres (22 in) long. It had a streamlined body with small, triangular ganoid scales similar to those of the Acanthodii. Cheirolepis had well-developed fins which gave it speed and stability, and was probably an active predator. Based on the size of its eyes, it hunted by sight. Cheirolepis's jaws, lined with sharp teeth, could be opened very wide, allowing it to swallow prey two thirds of its own size.

Read more about Cheirolepis at Wikipedia
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