Casierius is an extinct genus of marine ray-finned fish that lived during the Albian stage of the Early Cretaceous epoch.

[1] It was a relative of the modern bonefish in the extinct family Phyllodontidae, although some authorities consider it either a true albulid (making it even more closely related to bonefish) or a very early eel.

[2][3][4][5] It contains a single species, C. heckeli, known from the Glen Rose Formation near Hood County, Texas.

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