See text Synechodontiformes is an extinct order of prehistoric shark-like cartilaginous fish, known from the Permian to the Paleogene.

They are considered to be members of Neoselachii, the group that contains modern sharks and rays.

[6] The main shared characters of the group relate to teeth anatomy.

[7] The oldest known synechodontiform remains are teeth of Synechodus antiquus from the early Permian (Cisuralian) of the Ural Mountains.

[8] However, other authors have considered the attribution to the teeth to Synechodus to be questionable.