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Pycnodonte (Pegma)
Taxonomy
Pycnodonte (Pegma) was named by Squires and Demetrion (1990) [Sepkoski's age data: T Eo-l T Eo-m-l].
It was reranked as Pegma by Sepkoski (2002).
It was assigned to Pycnodonte by Squires and Demetrion (1990) and Squires and Demetrion (1992); and to Pterioida by Sepkoski (2002).
It was reranked as Pegma by Sepkoski (2002).
It was assigned to Pycnodonte by Squires and Demetrion (1990) and Squires and Demetrion (1992); and to Pterioida by Sepkoski (2002).
Subtaxa
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1990 | Pycnodonte (Pegma) Squires and Demetrion p. 286 |
| 1992 | Pycnodonte (Pegma) Squires and Demetrion p. 39 |
| 2002 | Pegma Sepkoski |
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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.
Subg. †Pycnodonte (Pegma) Squires and Demetrion 1990
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†Pycnodonte (Pegma) bajaensis Squires and Demetrion 1990
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: g = genus, f = family, o = order, c = class | |||||
| References: Steuber 2002, Aberhan et al. 2004, Hendy et al. 2009, Kiessling 2004 | |||||
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Ypresian | Mexico (Baja California Sur) | Pycnodonte bajaensis (5496 5507 7928) | |
| Ypresian | Mexico (Baja California) | Pycnodonte bajaensis (5506) | |
| Lutetian | Mexico (Baja California) | Pycnodonte bajaensis (5504 5505) |