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Acrocyathus pennsylvanicus
Taxonomy
Lithostrotion pennsylvanicum was named by Shimer (1926).
It was recombined as Lithostrotionella pennsylvanica by Kelly (1942); it was recombined as Lonsdaleia pennsylvanica by Crickmay (1955); it was recombined as Acrocyathus pennsylvanicus by Sando (1983).
It was recombined as Lithostrotionella pennsylvanica by Kelly (1942); it was recombined as Lonsdaleia pennsylvanica by Crickmay (1955); it was recombined as Acrocyathus pennsylvanicus by Sando (1983).
Synonymy list
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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.
†Acrocyathus pennsylvanicus Shimer 1926
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. J. Sando 1983 | Cerioid Acrocyathus with c_orallite diameter 10 to 17 mm and 18 to 23 major septa that or-dinarily approach the columella but do not reach it and seldom extend into the dissepimentarium. Minor septa weakly developed. Columella complex, composed of an axial plate, septal lamellae, and axial tabellae or up-turned edges of tabulae. Dissepimentarium composed of 1 to 3 rows of large and small inflated dissepiments. Tabulae complete, conical, sharply deflected upward at columella, without shoulders or with poorly defined shoulders, and spaced about 0.5 mm apart. Ratio of tabularium width to corallite diameter 0.5 to 0.8. Mode of increase unknown. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| Reference: Kiessling 2004 | |||||
Age range: Meramecian or 343.00000 to 335.50000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Meramecian | Canada (Alberta) | Lithostrotionella pennsylvanica (62575 62582) |