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Nanorthis
Taxonomy
Nanorthis was named by Ulrich and Cooper (1936) [Sepkoski's age data: O Trem-l O Aren-l Sepkoski's reference number: 1]. It is the type genus of Nanorthidae.
It was assigned to Orthinae by Ulrich and Cooper (1936); to Nanorthidae by Williams et al. (2000); to Orthida by Sepkoski (2002); and to Plectorthidae by Williams et al. (2007).
It was assigned to Orthinae by Ulrich and Cooper (1936); to Nanorthidae by Williams et al. (2000); to Orthida by Sepkoski (2002); and to Plectorthidae by Williams et al. (2007).
Species
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1936 | Nanorthis Ulrich and Cooper p. 621 |
| 2000 | Nanorthis Williams et al. p. 742 |
| 2002 | Evenkinorthis Sepkoski |
| 2002 | Nanorthis Sepkoski |
| 2007 | Nanorthis Williams et al. p. 2690 |
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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. †Nanorthis Ulrich and Cooper 1936
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†Nanorthis carinata Laurie 1980
†Nanorthis hamburgensis Walcott 1884
†Nanorthis purmamarcaensis Benedetto and Carrasco 2002
†Nanorthis putilla Walcott 1924
Invalid names: Evenkinorthis [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. O. Ulrich and G. A. Cooper 1936 | Small, subcircular, fascicostellate, dorsal interior like Archaeorthis, but ventral valve without muscular callosity. |