Palaeonisciformes

The Palaeonisciformes (Palaeoniscida) are an extinct order of early ray-finned fishes. Palaeonisciformes "sensu lato" first appeared in the fossil record in the Late Silurian and last appeared in the Late Cretaceous. The name is derived from the Ancient Greek words παλαιός ("palaiós", ancient) and ὀνίσκος ("oniskos", 'cod-fish' or woodlouse), probably pertaining to the organization of the fishes' scales, similar to the exoskeletal plating of woodlice.