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Pentagonoceras attenuatum
Taxonomy
Pentagonoceras attenuatum was named by Zhao et al. (1978). Its type specimen is NIGP 14941 and is a 3D body fossil. Its type locality is Lijiachong, Lindai, Bed 2, Qingzhen County, which is in a Changhsingian marine limestone in the Changxing Formation of China.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1978 | Pentagonoceras attenuatum Zhao et al. p. 157 figs. Pl 30, figs 11,12; text-fig 103c |
| 1989 | Pentagonoceras attenuatum Sheng p. 199 figs. Pl 23, fig 2; text-fig 9 |
| 2002 | Pentagonoceras attenuatum Leonova |
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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.
†Pentagonoceras attenuatum Zhao et al. 1978
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 2 | 19.7 | 18.8 | 20.6 | 19.7 | 1.27 | |
| shell diameter | 2 | 54.7 | 54.2 | 55.3 | 54.8 | 0.778 | |
| shell inflation | 2 | 21.1 | 20.9 | 21.3 | 21.1 | 0.283 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: Changhsingian or 254.14000 to 251.90200 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Changhsingian | China (Sichuan) | Pentagonoceras attenuatum (148465) | |
| Changhsingian | China (Guizhou) | Pentagonoceras attenuatum (type locality: 98030) |