Cyathaspididae is an extinct family in the
heterostracan order
Order, ORDER or Orders may refer to:
* Categorization, the process in which ideas and objects are recognized, differentiated, and understood
* Heterarchy, a system of organization wherein the elements have the potential to be ranked a number of ...
Cyathaspidiformes
Cyathaspidiformes is an extinct order of heterostracan vertebrates known from extensive fossil remains primarily from Silurian to Early Devonian strata of Europe, and North America, and from Early Devonian marine strata of Siberia.
Anatomy
Lik ...
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[The Classification and Evolution of the Heterostraci. L. Beverly Tarlo, Acta Palaeontologica Polonica, 1962]
Cyathaspididae 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'', Cyathaspididae contains the following genera: †''
Americaspis'', †''
Archegonaspis'', †''
Capitaspis'', †''
Dikenaspis'', †''
Dinaspidella'', †''
Homaspidella'', †''
Irregulareaspis'', †''
Nahanniaspis'', †''
Pionaspis'', †''
Poraspis
''Poraspis'' is an extinct genus of heterostracan. Fossils are found in Late Silurian and Early Devonian marine strata of Norway, Canada and the United States
The United States of America (U.S.A. or USA), commonly known as the United ...
'', †''
Ptomaspis'', †''
Seretaspis'', †''
Steinaspis'', †''
Torpedaspis'' and †''
Veronaspis''.
References
External links
*
Cyathaspidida
Prehistoric jawless fish families
{{Pteraspidomorphi-stub