Ctenaspidae is a family of extinct cyathaspidiform heterostracan

agnatha Agnatha (; ) or jawless fish is a paraphyletic infraphylum of animals in the subphylum Vertebrata of the phylum Chordata, characterized by the lack of jaws. The group consists of both extant taxon, living (Cyclostomi, cyclostomes such as hagfish ...

ns in the suborder

Cyathaspidida Cyathaspidida is a taxon of extinct cyathaspidiform heterostracan agnathans whose fossils are found in Silurian to Lower Devonian marine strata of Europe and North America.Lundgren, Mette, and Henning Blom. "Phylogenetic relationships of the cy ...

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Amphiaspidida Amphiaspidida is a taxon of extinct Cyathaspidiformes, cyathaspidid heterostraci, heterostracan agnathans whose fossils are restricted to Lower Devonian marine strata of Siberia near the Taimyr Peninsula. Some authorities treat it as a suborder ...

can be ignored as a daughter-taxon, the family Ctenaspidae contains '' Ctenaspis'' and its various sister-taxa originally contained within both Ctenaspididae and Ctenaspididae, including '' Allocryptaspis'', '' Alainaspis'', '' 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 {{Devonian-jawless-fish-stub