Acipenser eruciferus

Ceratodus eruciferus was originally described by Edward Drinker Cope in 1876. It was later reassigned to Rhineastes eruciferus by Lawrence Lambe in 1902 and eventually reclassified as Acipenser eruciferus by Richard Estes in 1964. These changes suggest significant debate over its correct classification, moving from lungfish (Ceratodus) to another possible fish genus (Rhineastes) and then to sturgeons (Acipenser).

Since this species doesn't appear frequently in modern paleontological records, it may have been synonymized with another species or its classification may have been reconsidered further. If you're looking for more details, checking fossil databases or the original papers by Cope, Lambe, and Estes could provide better clarity.
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