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Semitreta
Taxonomy
Semitreta was named by Biernat (1973). Its type is Semitreta major.
It was assigned to Acrotretida by Sepkoski (2002); and to Acrotretidae by Williams et al. (2000) and Hansen and Holmer (2011).
It was assigned to Acrotretida by Sepkoski (2002); and to Acrotretidae by Williams et al. (2000) and Hansen and Holmer (2011).
Species
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1973 | Semitreta Biernat |
| 1975 | Hansotreta Krause and Rowell |
| 2000 | Hansotreta Williams et al. p. 112 |
| 2000 | Semitreta Williams et al. p. 119 |
| 2002 | Hansotreta Sepkoski |
| 2002 | Semitreta Sepkoski |
| 2011 | Semitreta Hansen and Holmer |
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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.
G. †Semitreta Biernat 1973
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†Semitreta acrobela Krause and Rowell 1975
†Semitreta basisslettaensis Hansen and Holmer 2011
†Semitreta major Biernat 1973
†Semitreta pustulosa Hansen and Holmer 2011
†Semitreta spitsbergensis Hansen and Holmer 2011
Invalid names: Hansotreta Krause and Rowell 1975 [synonym]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order, c = class, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Nesnidal et al. 2013 | |||||
Age range: base of the Tremadocian to the top of the Darriwilian or 485.40000 to 458.40000 Ma
Collections (9 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Tremadoc | Poland | S. maior (66196) | |
| Tremadocian | Mexico (Oaxaca) | S. sp. (106264) | |
| Bendigonian | Australia (Western Australia) | S. lauriei (157151) | |
| Blackhillsian | Norway (Spitsbergen) | S. basisslettaensis (189945 189947) S. spitsbergensis (189899) | |
| Dapingian | Norway (Spitsbergen) | S. spitsbergensis (189848) | |
| Darriwilian | Norway (Spitsbergen) | S. pustulosa (189858 189871) |