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Protocycloceras lamarcki

Cephalopoda - Ellesmerocerida - Protocycloceratidae

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).

Synonyms
Synonymy list
YearName and author
1859Orthoceras becki Billings p. 362 figs. fig. 11 f,g,h
1859Orthoceras lamarcki Billings p. 362
1859Protocycloceras landmarcki Billings p. 574
1900Protocycloceras lamarcki Hyatt
1906Protocycloceras lamarcki Ruedemann
1906Protocycloceras whitfieldi Ruedemann p. 443 figs. pl. 15, fig. 7, text-fig. 17
1944Protocycloceras mendax Ulrich et al.
1955Protocycloceras landmarcki Major and Winsnes
1994Rhabdocycloceras floweri Zhuravleva
2009Protocycloceras lamarcki Kröger and Landing
2011Protocycloceras lamarcki Evans

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
RankNameAuthor
phylumMollusca
classCephalopodaCuvier 1797
orderEllesmerocerida()
familyProtocycloceratidaeKobayashi 1935
genusProtocycloceras
specieslamarcki()

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
ReferenceDiagnosis
E. Billings 1859Description 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 1900Annulated orthoceracones and cyrtoceracones without longitudinal ridges. Siphuncle large