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Named By: Louis Agassiz in 1835/39/43
Time Period: Late Devonian-Mississippian~383-318 Ma
Location: Possibly worldwide with some known locations including Belgium, Russia and the United Kingdom
Size: About 50 centimetres long, some variation between species
Diet: Carnivore/Piscivore
Fossil(s): Many individuals
Classification: | Chordata | Sarcopterygii | Porolepiformes | Holoptychiidae |

Holoptychius is an extinct genus of porolepiform lobe-finned fish from the Middle Devonian to Carboniferous (Mississippian) periods. It is known from fossils worldwide. The genus was first described by Louis Agassiz in 1839.

Read more about Holoptychius at Wikipedia
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