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Tyersella
Taxonomy
Tyersella was named as a genus. It is not extant.
It was reranked as Isorthis (Tyersella) by Sheehan (1976).
It was assigned to Isorthis by Sheehan (1976); to Isorthinae by Williams et al. (2000); and to Orthida by Sepkoski (2002).
It was reranked as Isorthis (Tyersella) by Sheehan (1976).
It was assigned to Isorthis by Sheehan (1976); to Isorthinae by Williams et al. (2000); and to Orthida by Sepkoski (2002).
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1976 | Isorthis (Tyersella) Sheehan p. 716 |
| 2000 | Tyersella Williams et al. p. 793 |
| 2002 | Tyersella 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. †Tyersella
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†Isorthis (Tyersella) amplificata Walmsley 1965
†Tyersella typica Philip 1962
Diagnosis
No diagnoses are available