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Fredericksia
Taxonomy
Fredericksia was named as a genus. It is not extant.
It was reranked as Martinia (Fredericksia) by Reed (1944).
It was assigned to Martinia by Reed (1944); to Spiriferida by Sepkoski (2002); and to Ingelarellinae by Williams et al. (2006).
It was reranked as Martinia (Fredericksia) by Reed (1944).
It was assigned to Martinia by Reed (1944); to Spiriferida by Sepkoski (2002); and to Ingelarellinae by Williams et al. (2006).
Synonymy list
| Year | Name and author |
|---|---|
| 1944 | Martinia (Fredericksia) Reed p. 230 |
| 2002 | Fredericksia Sepkoski |
| 2006 | Fredericksia Williams et al. p. 1758 |
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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. †Fredericksia
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†Fredericksia irbytschanensis Zavodowsky 1968
†Fredericksia simensis Tschernyschew 1902
†Martinia (Fredericksia) khurensis Reed 1944
Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 4 | 13.6 | 12.5 | 14.4 | 13.8 | 0.822 |
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| Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Aberhan et al. 2004 | |||||
Age range: base of the Asselian to the top of the Changhsingian or 298.90000 to 251.90200 Ma
Collections (8 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Asselian | Russian Federation | F. simensis (110210) | |
| Sakmarian | India | F. sp. (117911) | |
| Sakmarian | Russian Federation | F. simensis (110167) | |
| Sakmarian | Australia (Western Australia) | F. n. sp. A (101232) | |
| Sakmarian | Russian Federation (Komi) | F. simensis (133120) | |
| Kungurian | Australia (Western Australia) | F. n. sp. B (84354) | |
| Roadian - Capitanian | Russian Federation | F. irbytschanensis (110261) | |
| Wuchiapingian - Changhsingian | Pakistan | Martinia khurensis (126705) |