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Sigmoidella
Taxonomy
Sigmoidella was named by Cushman and Ozawa (1928) [Sepkoski's age data: T Eo-m R]. It is extant. It was considered unknown by Cushman and Ozawa (1928).
It was assigned to Polymorphininae by Cushman and Ozawa (1928); and to Foraminiferida by Sepkoski (2002).
It was assigned to Polymorphininae by Cushman and Ozawa (1928); and to Foraminiferida by Sepkoski (2002).
Synonymy list
| Year | Name and author |
|---|---|
| 1928 | Sigmoidella Cushman and Ozawa |
| 2002 | Sigmoidella 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. Sigmoidella Cushman and Ozawa 1928
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. A. Cushman and Y. Ozawa 1928 | Test ovate to elliptical in side view, compressed; chambers
elongate, angular, regularly arranged in open sigmoid series, gradually increasing in length in the later ones which include the earlier ones, but often the adult chambers not reaching the base; sutures distinct. Having much compressed chambers arranged in planes more than 180° from one another similar to Sigmoilina in the Miliolidae. |