Extinct jawless fish abundant in lower Devonian times. Pteraspids has massive plated head shields, which could be almost as long as the rest of the body; scaly tails; and only one fin – the tail, or caudal, fin. They are belived to have lived at the bottom of shallow seas, scooping up small invertebrates with their mouth plates. Drepanaspis gemuendenensis is an example of this group.

Classification
Pteraspids form an order, Pteraspidiformes, in class Pteraspidomorphi, superclass Agnatha.