Tarasiiformes is an extinct order of prehistoric ray-finned fish.[1]
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Tarrasius is an extinct genus of Tarasiiformes. Tarrasius problematicus (of Mississippian origin, ~ 350 Ma) featured a fully regionalized tetrapod-like spine divided into 5 distinct segments.[5] [6] It is not considered a transitional fossil though, but an extreme example of convergent evolution.