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Cyathaspida
Taxonomy
Cyathaspida was named by Kiaer (1932).
It was assigned to Heterostraci by Kiaer (1932); and to Heterostraci by Loeffler and Dineley (1976).
It was assigned to Heterostraci by Kiaer (1932); and to Heterostraci by Loeffler and Dineley (1976).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 1932 | Cyathaspida Kiaer p. 7 |
| 1976 | Cyathaspida Loeffler and Dineley p. 757 |
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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. †Traquairaspidae Kiaer 1932
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G. †Traquairaspis Kiaer 1932
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†Traquairaspis adunata Dineley and Loeffler 1976
†Traquairaspis angusta Denison 1963
†Traquairaspis broadi Dineley and Loeffler 1976
†Traquairaspis campbelli Traquair 1913
†Traquairaspis denisoni Dineley 1964
†Traquairaspis guttata Dineley and Loeffler 1976
†Traquairaspis lemniscata Dineley and Loeffler 1976
†Traquairaspis longicarinata Thorsteinsson and Elliott 2022
†Traquairaspis mackenziensis Dineley and Loeffler 1976
†Traquairaspis poolei Dineley and Loeffler 1976
†Traquairaspis pristina Thorsteinsson and Elliott 2022
†Traquairaspis pustulata Dineley and Loeffler 1976
†Traquairaspis rambaldi Broad 1968
†Traquairaspis retusa Dineley and Loeffler 1976
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. †Arctictenaspis Elliott and Blieck 2010
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†Arctictenaspis borealis Thorsteinsson and Elliott 2022
†Arctictenaspis obruchevi Elliott and Blieck 2010
†Arctictenaspis ornata Elliott and Blieck 2010
†Arctictenaspis russelli Elliott and Blieck 2010
G. †Ctenaspis Kiaer 1930
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†Ctenaspis cancellata Kiaer 1930
†Ctenaspis cancellata Kiaer 1930
†Ctenaspis dentata Kiaer 1930
†Ctenaspis kiaeri Zych 1931
†Ctenaspis obruchevi Dineley 1976
†Ctenaspis ornata Dineley 1976
†Ctenaspis russelli Dineley 1976
Fm. †Palaeaspidae Kiaer 1932
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G. †Americaspis White and Moy-Thomas 1941
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†Americaspis americana Claypole 1884
†Americaspis bitruncata Claypole 1884
†Americaspis claypolei Denison 1964
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. |
Measurements
No measurements are available
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| Source: subp = subphylum, p = phylum | |||||
| References: Carroll 1988, Kiessling 2004 | |||||
Age range: base of the Homerian to the top of the Late/Upper Emsian or 430.60000 to 393.47000 Ma
Collections (45 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Silurian | Canada (Yukon) | Homalaspidella borealis (185831) | |
| Wenlock | United Kingdom (Scotland) | Traquairaspis campbelli (26907) | |
| Homerian | Canada (Northwest Territories) | Traquairaspis lemniscata (497) | |
| Ludlow | USA (Pennsylvania) | Americaspis sp. (14206) | |
| Ludlow - Pridoli | USA (Pennsylvania) | Americaspis americana, Americaspis bitruncata (239072) | |
| Ludlow - Pridoli | Canada (Nunavut) | Traquairaspis sp. (237773 237776 237777 237779) | |
| Ludlow - Pridoli | USA (New York) | Americaspis claypolei (239074) | |
| Ludlow - Early/Lower Emsian | Canada (Northwest Territories) | Homalaspidella sp., Traquairaspis pustulata (237827) | |
| Ludfordian | Sweden (Gotland) | Cyathaspida indet. (13820) | |
| Pridoli | Canada (Nunavut) | Cyathaspidida indet. (90324) | |
| Pridoli | Canada (Northwest Territories) | Homalaspidella sp., Homalaspidella borealis, Traquairaspis lemniscata (237845) | |
| Lochkovian | Canada (Nova Scotia) | Traquairaspis sp. (14201) | |
| Lochkovian | Canada (Nunavut) | Ctenaspis obruchevi (238128) Ctenaspis russelli (90322 238035) Traquairaspidae indet. (238040) Traquairaspis rambaldi (239407) Traquairaspis sp. (237782 237783 237784 237785 237786 238042) | |
| Lochkovian | Canada (Nunavat) | Arctictenaspis russelli, Arctictenaspis obruchevi (204935) | |
| Lochkovian | Russian Federation | Ctenaspis sp., Ctenaspis sp. 1, Homalaspidella sp. (90330) | |
| Lochkovian | Ukraine | Ctenaspis kiaeri (239124) Palaeaspis simionescui (90350) Traquairaspis sp. (26978) | |
| Lochkovian | Norway | Ctenaspis sp. (237820) Ctenaspis sp., Homalaspidella nitida (237821) Ctenaspis sp., Traquairaspis sp. (26929) Homalaspidella sp., Ctenaspis dentata (237826) Homalaspidella sp., Ctenaspis dentata, Ctenaspis cancellata (237822) Traquairaspis sp. (237814 237816 237817) Traquairaspis sp., Homalaspidella sp. (237818) Traquairaspis sp., Homalaspidella sp., Ctenaspis dentata (237823) | |
| Lochkovian - Pragian | Canada (Nunavut) | Ctenaspis ornata, Arctictenaspis ornata (239104) | |
| Lochkovian - Early/Lower Emsian | Canada (Northwest Territories) | Traquairaspis lemniscata, Traquairaspis pustulata (237844) Traquairaspis poolei, Traquairaspis adunata, Traquairaspis guttata, Traquairaspis retusa, Traquairaspis broadi, Traquairaspis mackenziensis, Traquairaspis pustulata (237843) | |
| Late/Upper Emsian | USA (Nevada) | Zaphoctenaspis meemannae (237780) |