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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Aulacostephanus (Aulacostephanus) yo
Taxonomy
Ammonites yo was named by d'Orbigny (1850). Its type specimen is MNHN.F.R04160 and is a 3D body fossil.
It was recombined as Aulacostephanus (Aulacostephanus) yo by Mesezhnikov (1984).
It was recombined as Aulacostephanus (Aulacostephanus) yo by Mesezhnikov (1984).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1845 | Ammonites yo d'Orbigny p. 545 fig. 210 |
| 1850 | Ammonites yo d'Orbigny p. 545 figs. Pl. 210, Fig 1-3 |
| 1984 | Aulacostephanus (Aulacostephanus) yo Mesezhnikov p. 121 figs. Pl 36, figs 1,2; pl 44, fig 2 |
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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.
†Aulacostephanus (Aulacostephanus) yo d'Orbigny 1850
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 5 | 60.5 | 41.3 | 100.8 | 52.9 | 25.5 | |
| shell diameter | 5 | 124.9 | 86.0 | 210.0 | 108.0 | 52.8 | |
| shell inflation | 5 | 26.8 | 16.3 | 48.3 | 27.0 | 13.3 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: Late/Upper Kimmeridgian or 155.70000 to 150.80000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Kimmeridgian | Russian Federation (Khanty-Mansi Autonomous Okrug) | Aulacostephanus yo (58779 58781 58782) | |
| Late/Upper Kimmeridgian | Russian Federation | Aulacostephanus yo (58850 58851) |