PBDB Taxon

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Cyathaspida

Pteraspidomorpha

Taxonomy

Cyathaspida was named by Kiaer (1932).

It was assigned to Heterostraci by Kiaer (1932); and to Heterostraci by Loeffler and Dineley (1976).

Subtaxa

Cyathaspidei, Homalaspidella, Irregulareaspis, Poraspidei

Synonymy list

Year	Name and author
1932	Cyathaspida Kiaer p. 7
1976	Cyathaspida Loeffler and Dineley p. 757

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Craniata

Rank	Name	Author
superclass	Pteraspidomorphi	(Goodrich 1909)
class	Pteraspidomorpha
subclass	Heterostraci	Lankester 1868
suborder	Cyathaspida
suborder	Cyathaspida

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Subor. †Cyathaspida Kiaer 1932

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Unr. †Cyathaspidei Kiaer 1932

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Fm. †Diplaspidae Kiaer 1932

G. †Diplaspis Matthew 1887

†Diplaspis acadica Matthew 1888

Fm. †Tolypaspidae Kiaer 1932

G. †Tolypaspis Schmidt 1893

†Tolypaspis undulata Pander 1856

Fm. †Traquairaspidae Kiaer 1932

G. †Phialaspis Wills 1935

Invalid names: Traquairaspis Kiaer 1932 [replaced]

G. †Homalaspidella Strand 1934

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†Homalaspidella borealis Denison 1963

G. †Irregulareaspis Zych 1931

Unr. †Poraspidei Kiaer 1932

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Fm. †Anglaspidae Kiaer 1932

G. †Anglaspis

†Anglaspis elongata Kiaer 1932

†Anglaspis heintzi Kiaer 1932

†Anglaspis insignis Kiaer 1932

†Anglaspis insignis brevis Kiaer 1932

†Anglaspis macculloughi Woodward 1891

†Anglaspis platostriata Kiaer 1932

Fm. †Ctenaspidae Kiaer 1930

G. †Ctenaspis

†Ctenaspis conselatus Kiaer 1930

†Ctenaspis dentatus Kiaer 1930

†Ctenaspis kiaeri Zych 1931

Fm. †Dinaspidae Kiaer 1932

G. †Dinaspis Kiaer 1932

†Dinaspis parvula Kiaer 1932

†Dinaspis robusta Kiaer 1932

Fm. †Palaeaspidae Kiaer 1932

G. †Americaspis White and Moy-Thomas 1941

†Americaspis americana Claypole 1884

Invalid names: Palaeaspis Claypole 1884 [replaced]

Diagnosis

Reference	Diagnosis
J. Kiaer 1932	It is quite difficult to make an elaborate diagnosis of this suborder. The following characters are, however, common to all Cyathaspida and distinguish them from the suborder Pteraspida and Psammosteida. I. The orbits are not surrounded by the dorsal shield, but they only form semicircular notches on it. 2. The large oblong branchial plate situated between the dorsal and ventraI shields is quite detached. 3. The dentin ridges, forming the surface of the dermal skeIeton, are smooth, not crenated as in the Pteraspids.