Abstract
Recent classifications of Pteraspididae are considered, and it is concluded that because of rapid and sometimes parallel evolution, the vent ral face of the rostrum cannot be relied upon as the sole or most important diagnostic feature of a genus. A revised classification, based on several characters, is proposed, as follows: genus Pteraspis, including subgenera Protopteraspis, Althaspis, and Pteraspis; genus Rhinopteraspis; genus Protaspis, including subgenera Prolaspis and Cyrtaspidichthys; genus Doryaspis (name preoccupied). A new species from the Early Devonian Water Canyon formation of northeastern Utah is described as Protaspis (Protaspis) erroli.
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