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Eoursivivas
Taxonomy
Eoursivivas was named by Ota (1964) [Sepkoski's age data: K Nc]. It is not extant.
It was assigned to Corbulidae by Hayami (1975); to Myoida by Sepkoski (2002); and to Corbulinae by Squires and Saul (2004).
It was assigned to Corbulidae by Hayami (1975); to Myoida by Sepkoski (2002); and to Corbulinae by Squires and Saul (2004).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1964 | Eoursivivas Ota |
| 1975 | Eoursivivas Hayami |
| 2002 | Eoursiviva Sepkoski |
| 2004 | Eoursivivas Squires and Saul p. 119 |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. L. Squires and L. R. Saul 2004 | Shell medium, very elongate to subpyriform. Sculpture consisting of subdued, irregular bands. Keel weak to moderately well developed, with groove between it and posterior dorsal margin. |