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Paraphyletic taxon:
Order †
Cyathaspidiformes
Kiaer, 1930
(fish)
Taxa
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Hierarchy
Nomenclature
Taxonomy
Properties
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Links
Entity:
†Heterostraci (Subclass)
..†Ariaspididae (Family)
..†Cardipeltiformes (Order)
..†Corvaspidiformes (Order)
..†Ctenaspididae (Family)
..†Pteraspidiformes (Order)
..†tesselate Heterostraci
..†Traquairaspidiformes (Order)
..†Cyathaspidiformes (Order)
....†Amphiaspididae (Family)
....†Cyathaspididae (Family)
Concise hierarchy
(Kingdom)
Animalia
-
(Phylum)
Chordata
-
(Class)
Pteraspidomorpha
Phylogeny
Paraphyletic/Ancestral (para)
Ref:
Glinskiy, 2018: 221 ("pteraspids evolved from cyathaspids").
[implicit]
Current position
†
Heterostraci
(Subclass)
Lankester, 1868
Ref:
R. van der Laan, 2018
: 17; Randle et al., 2022: fig. 6.
Historical positions
†
Heterostraci
(Subclass)
Lankester, 1868
Ref:
R. van der Laan, 2018
: 17.
†
Heterostraci
(Subclass)
Lankester, 1868
Ref:
J.S. Nelson et al., 2016
: 28.
†
Heterostraci
(Subclass)
Lankester, 1868
Ref:
V. Voichyshyn, 2011
: 67.
†
Heterostraci
(Subclass)
Lankester, 1868
Ref:
J.S. Nelson, 2006
: 29.
Number of Subtaxa
2025
Available in Systema Naturae 2000
†2f;53g;34s
1989-present
Systema Naturae 2000
: 23 Mar 2024
[; †2f]
2018
R. van der Laan
: 18
[; †10f]
2016
J.S. Nelson et al.
: 29
[; †2f]
©2004-2025 Universal Taxonomic Services
Last updated:
21 Sep 2025