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Nikitinoceras (Russanovia) diptychum
Taxonomy
Ammonites diptychus was named by Keyserling (1846) [DISTRIBUTION: Valanginian; Russian Platform, Sibria, Greenland.]. It is not a trace fossil. It is the type species of Russanovia.
It was recombined as Nikitinoceras (Russanovia) diptychum by Alsen (2006).
It was recombined as Nikitinoceras (Russanovia) diptychum by Alsen (2006).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1846 | Ammonites diptychus Keyserling figs. pl. 20, figs. 4-5 |
| 2006 | Nikitinoceras (Russanovia) diptychum Alsen p. 69 |
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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.
†Nikitinoceras (Russanovia) diptychum Keyserling 1846
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 3 | 11.5 | 10.0 | 14.0 | 11.0 | 2.08 | |
| shell diameter | 3 | 35.2 | 30.5 | 41.0 | 35.0 | 5.27 | |
| shell inflation | 3 | 11.3 | 10.2 | 13.5 | 10.4 | 1.85 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: Early/Lower Valanginian or 137.05000 to 132.60000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Valanginian | Greenland | Nikitinoceras diptychum (83742) | |
| Late/Upper Valanginian | Greenland | Nikitinoceras diptychum (83717) | |
| Valanginian | Greenland | Nikitinoceras diptychum (83741) |