Concise hierarchy

(Kingdom) Animalia - (Phylum) Chordata - (Class) Placodermi - (Order) Phlyctaeniiformes

Subsequent positions

†Aspinothoracidi ([unranked]) Stensiö, 1959

Ref: R.K. Carr & W.J. Hlavin, 2010: 198 ("comb. nov.").

Current position

†Aspinothoracidi ([unranked]) Stensiö, 1959

Ref: R. van der Laan, 2018: 32; Boyle & Ryan, 2017: fig. 17. [new position]

Alternative positions

†Arthrothoraci (Order)	Ref: D.S. Jordan, 1923: 88.
†Coccosteomorphi ([unranked]) Stensiö, 1944	Ref: J.S. Nelson et al., 2016: 40. [implicit]
†Dinichthyloidea (Superfamily)	Ref: R.L. Carroll, 1988: 597.

Historical positions

†Aspinothoracidi ([unranked]) Stensiö, 1959	Ref: R. van der Laan, 2018: 32.
†coccosteomorphs ([unranked]) Stensiö, 1944	Ref: J.S. Nelson et al., 2016: 40.
†Aspinothoracidi ([unranked]) Stensiö, 1959	Ref: R.K. Carr & W.J. Hlavin, 2010: 198, 212-213, fig. 9B. [new position]
†Arthrodiriformes (Order) Grande & Eastman, 1986	Ref: J.S. Nelson, 2006: 39. [rough position]
†Dinichthyloidea (Superfamily)	Ref: R.L. Carroll, 1988: 597.
†Arthrothoraci (Order)	Ref: D.S. Jordan, 1923: 88.

Number of Subtaxa

2025	Available in Systema Naturae 2000	†1g;1s
1989-present	Systema Naturae 2000: 10 May 2017	[; †1g;1s]
2010	R.K. Carr & W.J. Hlavin: 198	[; †1g;1s]