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Protocycloceras lamarcki
Discussion
Taxonomy
Orthoceras lamarcki was named by Billings (1859) [error transcribing name].
It was recombined as Protocycloceras landmarcki by Billings (1859); it was recombined as Protocycloceras mendax by Ulrich et al. (1944); it was recombined as Protocycloceras lamarcki by Hyatt (1900), Hyatt (1900), Ruedemann (1906), Kröger and Landing (2009) and Evans (2011).
It was recombined as Protocycloceras landmarcki by Billings (1859); it was recombined as Protocycloceras mendax by Ulrich et al. (1944); it was recombined as Protocycloceras lamarcki by Hyatt (1900), Hyatt (1900), Ruedemann (1906), Kröger and Landing (2009) and Evans (2011).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1859 | Orthoceras becki Billings p. 362 fig. 11a |
| 1859 | Orthoceras lamarcki Billings p. 362 |
| 1859 | Protocycloceras landmarcki Billings p. 574 |
| 1900 | Protocycloceras lamarcki Hyatt |
| 1906 | Protocycloceras lamarcki Ruedemann |
| 1906 | Protocycloceras whitfieldi Ruedemann p. 443 figs. pl. 15, fig. 7, text-fig. 17 |
| 1944 | Protocycloceras mendax Ulrich et al. |
| 1955 | Protocycloceras landmarcki Major and Winsnes |
| 1994 | Rhabdocycloceras floweri Zhuravleva |
| 2009 | Protocycloceras lamarcki Kröger and Landing |
| 2011 | Protocycloceras lamarcki Evans |
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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.
†Protocycloceras lamarcki Billings 1859
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Invalid names: Protocycloceras becki Billings 1859 [synonym], Protocycloceras whitfieldi Ruedemann 1906 [synonym], Rhabdocycloceras floweri Zhuravleva 1994 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. Billings 1859 | Description Annulated tapering at the rate of about one line to the inch section circular septa gently convex eight in one inch at a diameter of eight lines more numerous towards the apex siphuncle cylindrical a little excentric its diameter full one third the diameter of the whole shell The annulations are rather prominent rounded ridges with regularly concave spaces between distant one line and a half from each other in a specimen eight lines in diameter The specimen figured is silicified and it is impossible to say whether the surface is striated or not Three specimens have been collected and all are a little curved The septa increase rapidly in number towards the smaller extremity of the shell and it would appear also that in some individuals the distance is variable In one specimen where the diameter is five lines there are five septa in half an inch but in the next half inch there are eight The position of the siphuncle is also a little variable Resembles externally the large curved O subarcuatum Hall of the Chazy limestone but that species has more distant septa and a siphuncle composed of large oval bead like segments Locality and formation Occurs at the Mingan Islands and also on Lot 12 Con 12 Township of Godmanchester Calciferous Sandrock Collectors Sir WE Logan T Richardson | |
| A. Hyatt 1900 | Annulated orthoceracones and cyrtoceracones without longitudinal ridges. Siphuncle large |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Aberhan et al. 2004 | |||||
Collections (16 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Jeffersonian - Rangerian | Canada (Quebec) | Protocycloceras becki (99217) | |
| Early/Lower Ordovician | Svalbard and Jan Mayen | Protocycloceras landmarcki (212926) | |
| Cassinian | USA (New York) | Orthoceras lamarcki, Protocycloceras lamarcki (42782) Protocycloceras lamarcki (42798 90082 90194 90195 171787) | |
| Cassinian | Canada (Newfoundland and Labrador) | Protocycloceras lamarcki (56150 69196 133134) | |
| Cassinian | USA (Vermont) | Protocycloceras whitfieldi (42793) | |
| Tulean - Blackhillsian | Canada (Newfoundland and Labrador) | Protocycloceras lamarcki (196381) | |
| Floian | Canada (Newfoundland) | Protocycloceras lamarcki (195746 195748) | |
| Floian | Russian Federation (Siberia) | Protocycloceras lamarcki (206297) |