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Pentagonoceras costatum
Taxonomy
Pentagonoceras costatum was named by Zhao et al. (1978). Its type specimen is NIGP 14940 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. It is the type species of Pentagonoceras.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1978 | Pentagonoceras costatum Zhao et al. p. 156 figs. Pl 30, figs 9,10,13,14; text-fig 103d |
| 2002 | Pentagonoceras costatum 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 costatum 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 | 18.0 | 16.0 | 20.2 | 18.1 | 2.97 | |
| shell diameter | 2 | 48.6 | 42.2 | 56.0 | 49.1 | 9.76 | |
| shell inflation | 2 | 16.1 | 13.4 | 19.3 | 16.4 | 4.17 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: Changhsingian or 254.17000 to 252.17000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Changhsingian | China (Guizhou) | Pentagonoceras costatum (type locality: 98030) |