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Taxonomy
Psilocephalinella was named by Kobayashi (1951) [Sepkoski's age data: Cm Trep O Trem-l Sepkoski's reference number: 378]. It is not extant.
It was assigned to Asaphida by Sepkoski (2002); and to Nileidae by Jell and Adrain (2002).
It was assigned to Asaphida by Sepkoski (2002); and to Nileidae by Jell and Adrain (2002).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1951 | Psilocephalinella Kobayashi |
| 1951 | Borthaspis Stubblefield |
| 2002 | Psilocephalinella Jell and Adrain p. 435 |
| 2002 | Borthaspis Sepkoski |
| 2002 | Psilocephalinella Sepkoski |
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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. †Psilocephalinella Kobayashi 1951
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Invalid names: Borthaspis Stubblefield 1951 [objective synonym]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: f = family, o = order, c = class | |||||
| References: Hendy et al. 2009, Hendy 2009, Aberhan et al. 2004 | |||||
Age range: Cressagian or 486.40000 to 481.10000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Cressagian | United Kingdom (England) | P. sp. (3712) |