Ctenaspidae is a family of extinct
cyathaspidiform heterostracan agnathans in the suborder
Cyathaspidida.
If
Amphiaspidida
Amphiaspidida is a taxon of extinct cyathaspidid heterostracan agnathans whose fossils are restricted to Lower Devonian marine strata of Siberia near the Taimyr Peninsula. Some authorities treat it as a suborder of Cyathaspidiformes,Lundgre ...
can be ignored as a daughter-taxon, the family Ctenaspidae contains ''
Ctenaspis
''Ctenaspis'' (''Ctenaspis kaieri'') is an extinct genus of heterostracan cyathaspid agnathans from the early Devonian of Canada, Norway and Russia 416.0 to 412.3 million years ago. Species of ''Ctenaspis'' are typically 10 to 18 cm long with t ...
'' and its various sister-taxa originally contained within both Ctenaspididae and Ctenaspididae, including ''
Allocryptaspis'', ''
Alainaspis
''Alainaspis platyrhina'' is an extinct cyathaspidid heterostracan agnathan vertebrate which existed in a marine environment in what is now the Northwest Territories of Canada, during the upper Silurian period. It was first named by David Ellio ...
'', ''
Zaphoctenaspis'', ''
Arctictenaspis'', and ''
Boothiaspis'', which was first described as a "Canadian amphiaspid."
[Lundgren, Mette, and Henning Blom. "Phylogenetic relationships of the cyathaspidids (Heterostraci)." GFF 135.1 (2013): 74-84.]
References
Cyathaspidida
Prehistoric jawless fish families
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