Ctenaspidae is a family of extinct
cyathaspidiform heterostracan
Heterostraci (Ancient Greek, ἕτερος+ὄστρακον "those itha different shell" i is pl. of -us is an extinct subclass of pteraspidomorph jawless vertebrate that lived primarily in marine and estuary environments. Heterostraci exi ...
agnatha
Agnatha (, Ancient Greek 'without jaws') is an infraphylum of jawless fish in the phylum Chordata, subphylum Vertebrata, consisting of both present (cyclostomes) and extinct ( conodonts and ostracoderms) species. Among recent animals, cyclosto ...
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 cya ...
.
If
Amphiaspidida 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
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