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Neopterygian node N (defining node of the ELOPOCEPHALA): The second ural centrum is overlain by two anteriorly extending uroneurals.
The cohort elopomorpha is known from the Early Cretaceous, and contains around 800 species including eels, tarpons and bone-fishes. Although this group contains extreme forms, elopomorphs can be grouped together with certainty on the basis of their undergoing a specialised thin and leaf-shaped marine larval stage, the leptocephalus, which can float long distances before their metamorphosis.