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Pycnoceras
Taxonomy
Pycnoceras was named by Hyatt (1894). Its type is Pycnoceras apertum.
It was assigned to Deltoceratidae by Ulrich et al. (1942); and to Estonioceratidae by Teichert et al. (1964), Crick (1981) and Stait (1983).
It was assigned to Deltoceratidae by Ulrich et al. (1942); and to Estonioceratidae by Teichert et al. (1964), Crick (1981) and Stait (1983).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1894 | Pycnoceras Hyatt p. 454 |
| 1942 | Pycnoceras Ulrich et al. |
| 1964 | Pycnoceras Teichert et al. p. 359 |
| 1981 | Pycnoceras Crick p. 228 |
| 1983 | Pycnoceras Stait |
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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. †Pycnoceras Hyatt 1894
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†Pycnoceras adamsense Stait 1983
†Pycnoceras apertum Hyatt 1894
†Pycnoceras calciferiforme Hyatt 1894
†Pycnoceras clausum Ulrich et al. 1942
†Pycnoceras rotundatum Ulrich et al. 1942
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Aberhan et al. 2004 | |||||
Age range: base of the Floian to the top of the Blackhillsian or 477.70000 to 470.00000 Ma
Collections (14 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Jeffersonian | Canada (Newfoundland and Labrador) | P. apertum, P. calciferiforme (98438) | |
| Tremadocian - Floian | Canada (Newfoundland and Labrador) | P. calciferiforme (98440) | |
| Canadian | Australia (Tasmania) | P. adamsense (189078) | |
| Tulean - Blackhillsian | USA (Missouri) | P. clausum (98444 98446 98451 98452 98454 98455 98456 98459) P. rotundatum (98458) | |
| Floian | Canada (Newfoundland) | P. apertum (195746) | |
| Floian | USA (Arkansas) | P. clausum (98457) |