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Petropegia
Taxonomy
Petropegia was named by Summerson and Campbell (1958) [Sepkoski's age data: C Mosc-l]. It is not extant. It is considered to be a form taxon. Its type is Petropegia radiata.
It was assigned to Calclamnidae by Summerson and Campbell (1958), Deflandre-Rigaud (1962), Frizzell and Exline (1966); and to Dendrochirotida by Sepkoski (2002).
It was assigned to Calclamnidae by Summerson and Campbell (1958), Deflandre-Rigaud (1962), Frizzell and Exline (1966); and to Dendrochirotida by Sepkoski (2002).
Species
P. radiata (type species), P. spinosa
Synonymy list
| Year | Name and author |
|---|---|
| 1958 | Petropegia Summerson and Campbell p. 965 |
| 1962 | Petropegia Deflandre-Rigaud p. 61 |
| 1966 | Petropegia Frizzell and Exline p. U664 |
| 2002 | Petropegia 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.
G. †Petropegia Summerson and Campbell 1958
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†Petropegia radiata Summerson and Campbell 1958
†Petropegia spinosa Summerson and Campbell 1958
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. H. Summerson and L. J. Campbell 1958 | Sclerites in form of large, flat perforate plates of varied outline and characterized by a spinose border. In some forms the spines are developed only peripherally; in others, they are recognizable as thickened or raised walls for some distance in toward the center of the plate. The general appearance is of a plate strengthened by radial supports. Perforations vary in size and arrangement; margins between the spines may be smooth or irregular; maximum known length of spines beyond margins, 0.25 mm. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum | |||||
| References: Aberhan et al. 2004, Aberhan 1992 | |||||
Age range: Middle Pennsylvanian or 315.20000 to 307.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Pennsylvanian | USA (Kentucky) | P. radiata, P. spinosa (97880) |