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Johnsonathyris
Taxonomy
Johnsonathyris was named by Savage et al. (1978) [Sepkoski's age data: D Fame-m D Fame-u Sepkoski's reference number: 53]. Its type is Johnsonathyris adrianensis.
It was assigned to Athyrididae by Savage et al. (1978); to Spiriferida by Sepkoski (2002); and to Athyridinae by Williams et al. (2002).
It was assigned to Athyrididae by Savage et al. (1978); to Spiriferida by Sepkoski (2002); and to Athyridinae by Williams et al. (2002).
Species
J. adrianensis (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1978 | Johnsonathyris Savage et al. p. 381 |
| 2002 | Johnsonathyris Sepkoski |
| 2002 | Johnsonathyris Williams et al. p. 1500 |
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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. †Johnsonathyris Savage et al. 1978
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†Johnsonathyris adrianensis Savage et al. 1978
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| N. M. Savage et al. 1978 | A small subglobular Athyridi dae, subcircular to pentagonal in outline. The anterior commissure is strongly uniplicate. Short, laterally convex dental lamellae lie close to the valve walls. The imperforate cardinal plate bears a shallow trough containing a small median ridge. The brachidium has spiralia with about six volutions j oined by a V-shaped jugum placed anterior of midlength. No jugal saddle or jugal stem is present. |
Measurements
No measurements are available
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| Source: subo = suborder, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Aberhan et al. 2004 | |||||