Eochondrosteus (meaning "dawn Chondrosteus") is a genus of extinct marine actinopterygian (ray-finned fish), comprising one species, E. sinensis (monotypy) from the Early Triassic strata in Gansu Province (Beishan Hills), China (previously interpreted as Permian in age).

It is suggested to be the most basal acipenseriform (sturgeon, paddlefish, and their fossil relatives).

[1] Other authors have considered the placement of Eochondrosteus within the Acipenseriformes as tentative.

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