What is "cyathaspidae"

Cyathaspidae is an extinct family in the heterostracan order Cyathaspidiformes.

Cyathaspidae contains most of the genera originally contained within Cyathaspididae, as well as those genera contained within Irregularaspididae, and Poraspididae. In addition to the type genus, † Cyathaspis, Cyathaspidae contains the following genera: † Americaspis, † Archegonaspis, † Capitaspis, † Dikenaspis, † Dinaspidella, † Homaspidella, † Irregulareaspis, † Nahanniaspis, † Pionaspis, † Poraspis, † Ptomaspis, † Seretaspis, † Steinaspis, † Torpedaspis and † Veronaspis.