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Margarites (Atira)
Taxonomy
Margarites (Atira) was named by Stewart (1927) [Sepkoski's age data: K Turo K Maes-u Sepkoski's reference number: 790]. Its type is Angaria ornatissima.
It was reranked as Atira by Knight et al. (1960), Sepkoski (2002) and Squires (2010).
It was assigned to Margarites by Stewart (1927); to Archaeogastropoda by Sepkoski (2002); and to Margaritinae by Knight et al. (1960) and Squires (2010).
It was reranked as Atira by Knight et al. (1960), Sepkoski (2002) and Squires (2010).
It was assigned to Margarites by Stewart (1927); to Archaeogastropoda by Sepkoski (2002); and to Margaritinae by Knight et al. (1960) and Squires (2010).
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1927 | Margarites (Atira) Stewart p. 315 figs. Plate XXIV, fig. 156 |
| 1960 | Atira Knight et al. p. 249 |
| 2002 | Atira Sepkoski |
| 2010 | Atira Squires p. 1023 |
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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.
Subg. †Margarites (Atira) Stewart 1927
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. L. Squires 2010 | Margaritine with spire relatively low, last whorl relatively large, ramp usually wide and usually flattish to slightly concave, peristome discontinuous, inner lip widest and flat in parietal region, umbilical margin angulate but usually not demarcated by spiral rib, ornament weak to nearly obsolete, and umbilical wall smooth or with cancellate ornamentation. |