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Polyptychites (Polyptychites) robertsi
Taxonomy
Polyptychites (Polyptychites) robertsi was named by Alsen (2006) [DISTRIBUTION: Valanginian; Greenland.]. It is not a trace fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2006 | Polyptychites (Polyptychites) robertsi Alsen p. 86 figs. pl. 31, figs. L-O |
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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.
†Polyptychites (Polyptychites) robertsi Alsen 2006
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 5 | 20.3 | 17.0 | 24.0 | 20.0 | 2.51 | |
| shell diameter | 5 | 49.3 | 43.0 | 67.0 | 47.0 | 9.70 | |
| shell inflation | 5 | 14.3 | 10.4 | 23.5 | 13.2 | 5.31 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: Late/Upper Valanginian or 137.05000 to 132.60000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Valanginian | Greenland | Polyptychites robertsi (83742) | |
| Late/Upper Valanginian | Greenland | Polyptychites robertsi (83717) |