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Pycnactis
Taxonomy
Pycnactis was named by Ryder (1926) [Sepkoski's age data: S Ldov-m S Ludl Sepkoski's reference number: 711]. It is not extant.
It was assigned to Lykophyllinae by Hill (1956); to Lykophyllidae by Merriam (1973) and Hill (1981); and to Rugosa by Sepkoski (2002).
It was assigned to Lykophyllinae by Hill (1956); to Lykophyllidae by Merriam (1973) and Hill (1981); and to Rugosa by Sepkoski (2002).
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.
G. †Pycnactis Ryder 1926
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. W. Merriam 1973 | Solitary trochoid rugose corals with long thickened major septa laterally in contact and pinnately arranged; cardinal septum long, minor septa very short or suppressed. Tabulae and dissepiments suppressed. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| Reference: Kiessling 2004 | |||||
Age range: base of the Hirnantian to the top of the Homerian or 445.20000 to 427.40000 Ma
Collections (20 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Wufeng | China (Guizhou) | P. sp. (4775) | |
| Hirnantian | China | P. sp. (61383) | |
| Llandovery | Canada (New Brunswick) | P. sp. (11437) | |
| Llandovery | China (Guizhou) | P. sp. (27898) | |
| Llandovery | USA (Kentucky) | P. tenuiseptatus (13232) | |
| Aeronian | China (Hubei) | P. sp. (27813) | |
| Aeronian | China (Guizhou) | P. sp. (27835) | |
| Aeronian | China | P. sp. (61428) | |
| Telychian | China (Yunnan) | P. sp. (27850) | |
| Telychian | China (Hubei) | P. angelini (27779) | |
| Telychian - Wenlock | Canada (Manitoba) | P. canadensis (26445 26629) | |
| Sheinwoodian | Sweden (Gotland) | P. sp. (13591) | |
| Wenlock | USA (Alaska) | P. sp. (100931) | |
| Wenlock | United Kingdom (England) | P. mitratus (49640) | |
| Wenlock | USA (California) | P. sp. (225993) P. sp. k. (226646) | |
| Wenlock - Ludlow | China (Sichuan) | P. sp. (27877 27878) | |
| Homerian | United Kingdom (England) | P. sp. (23057) |