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Ptygmactrum
Taxonomy
Ptygmactrum was named by Cooper and Grant (1976) [Sepkoski's age data: P Leon P Guad-l Sepkoski's reference number: 7]. Its type is Ptygmactrum extensum.
It was assigned to Petasmatheridae by Williams et al. (2002); and to Rhynchonellida by Sepkoski (2002).
It was assigned to Petasmatheridae by Williams et al. (2002); and to Rhynchonellida by Sepkoski (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1976 | Ptygmactrum Cooper and Grant p. 1939 |
| 2002 | Ptygmactrum Sepkoski |
| 2002 | Ptygmactrum Williams et al. p. 1276 |
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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.
G. †Ptygmactrum Cooper and Grant 1976
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†Ptygmactrum acutum Cooper and Grant 1976
†Ptygmactrum angulatum Cooper and Grant 1976
†Ptygmactrum depressum Cooper and Grant 1976
†Ptygmactrum extensum Cooper and Grant 1976
†Ptygmactrum mordicum Cooper and Grant 1976
†Ptygmactrum spiculatum Cooper and Grant 1976
Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 12 | 1.62 | 1.00 | 2.20 | 1.60 | 0.334 |
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| Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Nesnidal et al. 2013 | |||||
Collections (14 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Kungurian | USA (Texas) | P. angulatum (43516 43589) P. angulatum, P. mordicum (43494) P. extensum (43517) P. mordicum (43491) | |
| Roadian | USA (Texas) | P. acutum (102610) P. depressum (105743) P. depressum, P. extensum (101783) P. extensum (43518) P. mordicum (101808) P. sp. (43551 106109) P. sp., P. spiculatum (81693) | |
| Wordian | USA (Texas) | P. spiculatum (43550) |