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Redescription of the Ordovician cephalopod genus Centroonoceras Kobayashi, 1934

Published online by Cambridge University Press:  20 May 2016

Shuji Niko
Shuji Niko*
Affiliation:
Department of Environmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University, 1-7-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8521, Japan
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Extract

The genus Centroonoceras was proposed by Kobayashi (1934) for a Middle Ordovician cyrtoconic cephalopod from South Korea. The taxonomic position of Centroonoceras has remained ambiguous, however, due to insufficient documentation and illustration of its morphology. The type species, Centroonoceras tokunagai, was originally described by Kobayashi (1927) as a new taxon belonging to the family “Ooceratidae” of the order Oncocerida. When Kobayashi (1934) proposed Centroonoceras, he diagnosed the genus as an orthocerid cephalopod whose closest relationship was with Sactorthoceras Kobayashi, 1934. Flower (1946) later placed Centroonoceras in the family Sactorthoceratidae, an assignment followed by most subsequent workers, including Balashov and Zhuravleva (1962), Sweet (1964), and Chen and Zou (1984). Only Stait (1988) disagreed with Flower's assignment. He referred Centroonoceras to the family Proteoceratidae with the proviso that “this genus is extremely poorly known.” The purposes of the present report are 1) to clarify the generic concept of this enigmatic genus on the basis of the holotype of the type species and 2) to discuss its assignment.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 79 , Issue 5 , September 2005 , pp. 1028 - 1030
Copyright
Copyright © The Paleontological Society 

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References

Balashov, Z. G., and Zhuravleva, F. A. 1962. Order Orthoceratida, p. 82–93. In Ruzhencev, V. E. (ed.), Fundamentals of Paleontology (Osnovy Paleontologii). Volume V. Mollusca-Cephalopoda I. Izdatel'stvo Akademii Nauk SSSR, Moskva. (Translated from Russian, Israel Program for Scientific Translations, Jerusalem, 1974)Google Scholar
Chen, J., and Zou, X. 1984. Ordovician cephalopods from the Ordos area, China. Memoirs of Nanjing Institute of Geology and Palaeontology, 20:33–84, pls. 1–20. (In Chinese with English abstract)Google Scholar
Foerste, A. F. 1912. Strophomena and other fossils from Cincinnatian and Mohawkian horizons, chiefly in Ohio, Indiana, and Kentucky. Journal of the Science Laboratories, Denison University, 17:17–174.Google Scholar
Foerste, A. F. 1932. Black River and other cephalopods from Minnesota, Wisconsin, Michigan, and Ontario (part I). Denison University Bulletin, Journal of the Scientific Laboratories, 27:47–136, pls. 7–37.Google Scholar
Foerste, A. F. 1933. Black River and other cephalopods from Minnesota, Wisconsin, Michigan, and Ontario (part II). Denison University Bulletin, Journal of the Scientific Laboratories, 28:1–146.Google Scholar
Flower, R. H. 1939. Study of the Pseudorthoceratidae. Palaeontographica Americana, 2:1–214, pls. 1–9.Google Scholar
Flower, R. H. 1942. An arctic cephalopod faunule from the Cynthiana of Kentucky. Bulletins of American Paleontology, 27:1–50, pls. 1–4.Google Scholar
Flower, R. H. 1946. Ordovician cephalopods of the Cincinnati region. Part I. Bulletins of American Paleontology, 29:85–751, pls. 1–50.Google Scholar
Flower, R. H. 1955. New Chazyan orthocones. Journal of Paleontology, 29:806–830, pls. 77–81.Google Scholar
Flower, R. H. 1962. Part II. Notes on the Michelinocerida. New Mexico Bureau of Mines and Mineral Resources Memoir, 10:21–42, pls. 4–6.Google Scholar
Frey, R. C. 1995. Middle and Upper Ordovician nautiloid cephalopods of the Cincinnati Arch region of Kentucky, Indiana, and Ohio. U.S. Geological Survey Professional Paper, 1066P:P1–P126, pls. 1–22.Google Scholar
Hall, J., and Whitfield, R. P. 1875. Section I. Descriptions of invertebrate fossils, mainly from the Silurian System. Geological Survey of Ohio, 2:65–110, pls. 1–4.Google Scholar
Hyatt, A. 1883–1884. Genera of fossil cephalopods. Boston Society of Natural History Proceedings, 22:253–338.Google Scholar
Kobayashi, T. 1927. Ordovician fossils from Corea and South Manchuria. Japanese Journal of Geology and Geography, 5:173–212, pls. 18–22.Google Scholar
Kobayashi, T. 1934. The Cambro–Ordovician formations and faunas of South Chosen. Palaeontology. Pt I. Middle Ordovician faunas. Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, 3:329–519, pls. 1–44.Google Scholar
Niko, S. 2002. Revision of an Ordovician cephalopod Ormoceras yokoyamai (Kobayashi, 1927). Paleontological Research, 6:121–124.Google Scholar
Ruedemann, R. 1906. Cephalopoda of the Beekmantown and Chazy formations of the Champlain Basin. New York State Museum Bulletin, 90:393–611.Google Scholar
Stait, B. 1988. Nautiloids of the Lourdes Formation (Middle Ordovician), Port au Port Peninsula, western Newfoundland. New Mexico Bureau of Mines and Mineral Resources Memoir, 44:61–77.Google Scholar
Sweet, W. C. 1964. Nautiloidea–Orthocerida, p. K216–K261. In Moore, R. C. (ed.), Treatise on Invertebrate Paleontology. The Geological Society of America and the University of Kansas Press, Lawrence.Google Scholar
Wilson, A. E. 1961. Cephalopoda of the Ottawa Formation of the Ottawa–St. Lawrence Lowland. Geological Survey of Canada Bulletin, 67:1–106, pls. 1–35.Google Scholar
Yun, C. S. 1999. Three Ordovician cephalopods from the Jigunsan Formation of Korea. Paleontological Research, 3:65–80.Google Scholar