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Pygurostoma geometricum
Taxonomy
Clypeaster geometricus was named by Morton (1833). It is a 3D body fossil. Its type locality is Chesapeake and Delaware Canal (Marshalltown, ANSP), which is in a Campanian marine sandstone in the Marshalltown Formation of Delaware.
It was recombined as Pygurus geometricus by Clark and Twitchell (1915); it was recombined as Pygurostoma geometricum by Cooke (1953).
It was recombined as Pygurus geometricus by Clark and Twitchell (1915); it was recombined as Pygurostoma geometricum by Cooke (1953).
Synonymy list
| Year | Name and author |
|---|---|
| 1833 | Clypeaster geometricus Morton |
| 1915 | Pygurus geometricus Clark and Twitchell p. 72 |
| 1953 | Pygurostoma geometricum Cooke p. 14 figs. Pl 4, figs 15-20 |
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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.
†Pygurostoma geometricum Morton 1833
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum | |||||
| References: Aberhan et al. 2004, Kiessling 2004, Aberhan 1992 | |||||
Age range: Late/Upper Campanian or 83.50000 to 70.60000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian | USA (Delaware) | Clypeaster geometricus (78138) Pygurostoma geometricum (78120) |