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Protokionoceras
Taxonomy
Protokionoceras was named by Grabau and Shimer (1910).
It was assigned to Michelinoceratidae by Sweet (1958); to Geisonoceratidae by Teichert et al. (1964), Crick (1981); and to Orthocerida by Sepkoski (2002).
It was assigned to Michelinoceratidae by Sweet (1958); to Geisonoceratidae by Teichert et al. (1964), Crick (1981); and to Orthocerida by Sepkoski (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1910 | Protokionoceras Grabau and Shimer |
| 1958 | Protokionoceras Sweet |
| 1964 | Protokionoceras Teichert et al. p. 237 |
| 1981 | Protokionoceras Crick p. 228 |
| 2002 | Protokionoceras 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. †Protokionoceras Grabau and Shimer 1910
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†Protokionoceras fessicancellatum Kobayashi et al. 1984
†Protokionoceras strandi Troedsson 1932
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: c = class | |||||
| Reference: Kiessling 2004 | |||||
Age range: base of the Longvillian to the top of the Givetian or 457.20000 to 382.70000 Ma
Collections (21 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Soudleyan - Marshbrookian | Norway | P. sp. (2764 2945 2947 2948) | |
| Soudleyan - Marshbrookian | Norway (Oslo) | P. sp. (2762) | |
| Idavere - Nabala | Norway | P. strandi (164010) | |
| Longvillian - Marshbrookian | Norway | P. sp. (2763) | |
| Maysvillian | Canada (Ontario) | P. oneidaense (26302) | |
| Pirgu | Norway (Baerum) | P. isotelorum (163403) | |
| Llandovery | USA (New York) | P. sp. (443) | |
| Aeronian | China | P. guanuanensis (197396) | |
| Telychian | Canada (Quebec) | P. sp. (25250) | |
| Wenlock | USA (New York) | P. sp. (471) | |
| Wenlock - Silurian | USA (Wisconsin) | P. medullare (13017 13069 13075 13104 13107) | |
| Ludlow | Japan (Skikoku) | P. fessicancellatum (188691) | |
| Givetian | USA (Ohio) | P. sp. (38459 38460) |