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.[6]
| Casierius ↓ | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Albuliformes |
| Family: | †Phyllodontidae |
| Genus: | †Casierius Estes, 1969 |
| Species: |
†C. heckeli
|
| Binomial name | |
| †Casierius heckeli Estes, 1969 | |
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