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Cyathaspida

Pteraspidomorpha

Synonymy list
YearName and author
1932Cyathaspida Kiaer p. 7
1976Cyathaspida Loeffler and Dineley p. 757

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumCraniata
RankNameAuthor
superclassPteraspidomorphi(Goodrich 1909)
classPteraspidomorpha
subclassHeterostraciLankester 1868
suborderCyathaspida
suborderCyathaspida

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
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G. †Diplaspis Matthew 1887
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†Diplaspis acadica Matthew 1888
Fm. †Tolypaspidae Kiaer 1932
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G. †Tolypaspis Schmidt 1893
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†Tolypaspis undulata Pander 1856
Fm. †Traquairaspidae Kiaer 1932
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G. †Phialaspis Wills 1935
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Invalid names: Traquairaspis Kiaer 1932 [replaced]
G. †Homalaspidella Strand 1934
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†Homalaspidella borealis Denison 1963
†Homalaspidella nitida Kiaer 1932
Unr. †Poraspidei Kiaer 1932
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Fm. †Ctenaspidae Kiaer 1930
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G. †Ctenaspis
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†Ctenaspis conselatus Kiaer 1930
†Ctenaspis dentatus Kiaer 1930
†Ctenaspis kiaeri Zych 1931
†Ctenaspis obruchevi Dineley 1976
†Ctenaspis ornata Dineley 1976
†Ctenaspis russelli Dineley 1976
Fm. †Dinaspidae Kiaer 1932
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G. †Dinaspis Kiaer 1932
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†Dinaspis parvula Kiaer 1932
Fm. †Palaeaspidae Kiaer 1932
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G. †Americaspis White and Moy-Thomas 1941
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†Americaspis americana Claypole 1884
Invalid names: Palaeaspis Claypole 1884 [replaced]
Diagnosis
ReferenceDiagnosis
J. Kiaer 1932It 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.
Measurements
No measurements are available
Composition: hydroxyapatitesubp
Locomotion: actively mobilep
Created: 2007-09-27 04:49:26
Modified: 2017-03-09 14:07:44
Source: subp = subphylum, p = phylum
Reference: Kiessling 2004

Age range: base of the Homerian to the top of the Lochkovian or 430.50000 to 410.80000 Ma

Collections (38 total)


Time interval Ma Country or state Original ID and collection number
Silurian443.8 - 419.2Canada (Yukon) Homalaspidella borealis, Traquairaspis angusta (185831)
Wenlock433.4 - 427.4United Kingdom (Scotland) Traquairaspis campbelli (26907)
Homerian430.5 - 427.4Canada (Northwest Territories) Traquairaspis lemniscata (497)
Ludlow427.4 - 423.0USA (Pennsylvania) Americaspis sp. (14206)
Ludlow - Pridoli427.4 - 419.2Canada (Nunavut) Traquairaspis sp. (237773 237776 237777 237779)
Ludlow - Early/Lower Emsian427.4 - 402.5Canada (Northwest Territories) Homalaspidella sp. (237827)
Ludfordian425.6 - 423.0Sweden (Gotland) Cyathaspida indet. (13820)
Pridoli423.0 - 419.2Canada (Northwest Territories) Homalaspidella sp., Homalaspidella borealis, Traquairaspis lemniscata (237845)
Pridoli423.0 - 419.2Canada (Nunavut) Cyathaspidida indet. (90324)
Lochkovian419.2 - 410.8Russian Federation Ctenaspis sp., Ctenaspis sp. 1, Phialaspis sp., Homalaspidella sp. (90330)
Lochkovian419.2 - 410.8Norway Ctenaspis sp. (237820) Ctenaspis sp., Homalaspidella nitida (237821) Ctenaspis sp., Homalaspidella sp. (237822 237826) Ctenaspis sp., Traquairaspis sp. (26929) Ctenaspis sp., Traquairaspis sp., Homalaspidella sp. (237823) Traquairaspis sp. (237814 237816 237817) Traquairaspis sp., Homalaspidella sp. (237818)
Lochkovian419.2 - 410.8Ukraine Palaeaspis simionescui (90350) Traquairaspis sp. (26978)
Lochkovian419.2 - 410.8Canada (Nova Scotia) Traquairaspis sp. (14201)
Lochkovian419.2 - 410.8Canada (Nunavut) Ctenaspis obruchevi (238128) Ctenaspis russelli (90322 238035) Traquairaspidae indet. (238040) Traquairaspis sp. (237782 237783 237784 237785 237786 238042)
Lochkovian - Early/Lower Emsian419.2 - 402.5Canada (Northwest Territories) Traquairaspis lemniscata (237844) Traquairaspis poolei, Traquairaspis adunata, Traquairaspis guttata, Traquairaspis retusa, Traquairaspis broadi, Traquairaspis mackenziensis (237843)