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Taxon:
Subclass †
Pteraspidomorphi
Goodrich, 1909
(fish)
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Hierarchy
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Entity:
[Agnatha] (Class)
..[†Anaspida] (Order) - anaspids
..[Cephalaspidomorpha] (Subclass)
..[Cephalaspidomorphi] (Subclass)
..[†Conodonta] (Subclass)
..[Cyclostomata] (Subclass)
..[†Myllokunmingiida] (Subclass)
..[Myxinoidea] (Subclass) - hagfishes
..[Myxinoidea] (Order) - hagfishes
..[ostracoderms]
..[Petromyzoniformes] (Order)
..[Petromyzontia] (Order)
..[Petromyzontida] (Subclass) - lampreys
..[†Thelodonti] (Order)
..[†Thelodonti] (Subclass)
..[†unnamed] (Subclass)
..[†Pteraspidomorphi] (Subclass)
....[†Arandaspida] (Order)
....[†Astraspida] (Order)
....[†Heterostraci] (Order) - heterostracans
....[†Thelodontida] (Order)
Concise hierarchy
(Kingdom)
Animalia
-
(Phylum)
Chordata
-
(Class)
Agnatha
Current position
Agnatha
(Class)
Cope, 1889
Ref:
M.J. Benton, 2015
: [433]; Benton, 2015: box 3.1 (p. 48).
Alternative positions
†
Ostracodermata
(Class)
Ref:
B. Grzimek et al., 1974
: 45.
[inferred rank]
Historical positions
Agnatha
(Class)
Cope, 1889
Ref:
M.J. Benton, 2015
: [433], box 3.1 (p. 48).
Agnatha
(Class)
Cope, 1889
Ref:
M.J. Benton, 2005
: [389], box 3.1.
Agnatha
(Class)
Cope, 1889
Ref:
R.L. Carroll, 1988
: 595.
†
Ostracodermata
(Class)
Ref:
B. Grzimek et al., 1974
: 45.
[inferred rank]
Number of Subtaxa
1989-present
Systema Naturae 2000
[; †3o]
2015
M.J. Benton
: 434
[; †3o]
2005
M.J. Benton
[; †3o]
1988
R.L. Carroll
: 596
[; †2o;15f]
©2004-2025 Universal Taxonomic Services
Last updated:
21 Sep 2025