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Sphenodiscus siva
Taxonomy
Ammonites siva was named by Forbes (1846). Its type specimen is BMNH C51087, a shell, and it is a 3D body fossil. Its type locality is Pondicherry, which is in a Maastrichtian marine sandstone/claystone in the Valudavur Formation of India.
It was recombined as Sphenodiscus siva by Hyatt (1903), Kennedy and Henderson (1992).
It was recombined as Sphenodiscus siva by Hyatt (1903), Kennedy and Henderson (1992).
Synonymy list
| Year | Name and author |
|---|---|
| 1846 | Ammonites siva Forbes p. 110 figs. Pl 7, fig 6 |
| 1903 | Sphenodiscus siva Hyatt p. 83 |
| 1992 | Sphenodiscus siva Kennedy and Henderson p. 434 figs. Pl 15, figs 6-13; text-figs 6B,D,E |
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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.
†Sphenodiscus siva Forbes 1846
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 2 | 39.7 | 39.5 | 40.0 | 39.8 | 0.354 | |
| shell diameter | 2 | 64.5 | 64.0 | 65.0 | 64.5 | 0.707 | |
| shell inflation | 2 | 0.001 | 0.001 | 0.001 | 0.001 | - |
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: Late/Upper Maastrichtian or 72.20000 to 66.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Maastrichtian | India | Ammonites siva (41428) |