REVISION OF SOME COMMON CARBONIFEROUS GENERA OF NORTH AMERICAN ORTHOCERID NAUTILOIDS

Journal of Paleontology, Sep 2005 by Kröger, B, Mapes, R H

Discussion.-The species is widespread and relatively common beginning in the Mississippian (Chesterian) and extending throughout the Pennsylvanian of North America. It is distinguished from other species of Hebetorthoceras by its combination of a compressed, nearly smooth shell and its straight apex with slightly inflated first three chambers. Notable are the endosiphuncular deposits and the high variability in the diameter of the apex.

ACKNOWLEDGMENTS

We are grateful to T. Adrain, University of Iowa, and M. S. Florence, U.S. National Museum, who helped in the search for type material in their collections and lent it to us. We thank G. Rothwell, Ohio University, who helped with photographs, and A. Huffer, who compiled the voluminous location appendix. We are grateful for the helpful reviews by R. A. Davis, College of Mount St. Joseph, Cincinnati, and C. H. Holland, Trinity College, Dublin. RHM was partially supported in this research by a National Science Foundation Grant (EAR 0125479). BK completed his contribution while a Myron T. Sturgeon Associate Visiting Professor at the Department of Geological Sciences, Ohio University, Athens.

REFERENCES

BLIND, W. 1987. Vergleichend morphologische und schalenstrukturelle Untersuchungen an Gehausen von Nautilus potnpilius, Orthoceras sp., Pseudorthocems sp. und Kionoceras sp. Palaeontographica A, 198: 101-128.

BLIND, W. 1988. Comparative investigations on the shell morphology and structure of Nautilus pompilius, Orthoceras sp., Pseudorthoceras sp., and Kionoceras sp., p. 273-289. In J. Wiedmann and J. Kullmann (eds.), Cephalopods-Present and Past. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart.

BRAND, U. 1987. Biogeochemistry of nautiloids and paleoenvironmental apects of Buckhorn seawater (Pennsylvanian), southern Oklahoma. Palaeogeography, Palaeoecology, Palaeoclimatology, 61:255-264.

BRUGUIÉRE, J. G. 1789. Histoire naturell des vers. Volume 1, Pt. 1. Encyclopedie methodique, 6:1-757, Panckoucke, Paris.

CRICK, R. E. 1982. The mode and tempo of cameral deposit formation: Evidence of orthoconic nautiloid physiology and ecology, p. 113-118. In B. Mamet and M. J. Copeland (eds.), Proceedings of the Third North-American Paleontological Convention, 1.

DAVIS, R. A., AND C. B. CAMPBELL. 1966. An orthocerid cephalopod from the Cherokee Group of Marion County, Iowa. Proceedings of the Iowa Acadamy of Science, 73:279-284.

DOOUZHAEVA, L. 2002. Adolescent bactritoid, orthoceroid, ammonoid and coleoid shells from the Upper Carboniferous and Lower Permian of the South Urals. Abhandlungen der Geologischen Bundesanstalt, 57: 9-55.

DZIK, J. 1984. Phylogeny of the Nautiloidea. Palaeontologia Polonica, 45:3-203.

FISCHER, A. G., AND C. TEICHERT. 1969. Cameral deposits in cephalopod shells. University of Kansas Paleontological Contributions Paper, 37, 30p.

FLOWER, R. H. 1939. Study of the Pseudorthoceratidae. Palaeontographica Americana, 2(10): 1-214.

FLOWER, R. H., AND K. E. CASTER. 1935. The cephalopod fauna of the Conewango Series of the Upper Devonian in New York and Pennsylvania. Bulletins of American Paleontology, 22(75): 1-74.