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Pachydiscus (Pachydiscus) yama
Taxonomy
Ammonites yama was named by Forbes (1846). 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 Pachydiscus (Pachydiscus) yama by Kennedy and Henderson (1992).
It was recombined as Pachydiscus (Pachydiscus) yama by Kennedy and Henderson (1992).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1846 | Ammonites yama Forbes p. 107 figs. Pl 7, fig 4 |
| 1992 | Pachydiscus (Pachydiscus) yama Kennedy and Henderson p. 426 figs. Pl 10, figs 3-4; pl 12, figs 10-12 |
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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.
†Pachydiscus (Pachydiscus) yama Forbes 1846
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | |||||
|---|---|---|---|---|---|---|---|
| shell height | 1 | 7.00 | |||||
| shell diameter | 1 | 16.8 | |||||
| shell inflation | 1 | 4.00 |
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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 yama (41428) |