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Marocella: Antarctic specimens of an enigmatic Cambrian animal

Published online by Cambridge University Press:  20 May 2016

K. R. Evans*
Affiliation:
Department of Geology, The University of Kansas, Lawrence 66045

Abstract

Remarkably well-preserved specimens of Marocella Geyer, 1986, from the Lower Cambrian Shackleton Limestone of Antarctica show that although affinity with chondrophorine cnidarians is improbable, its rigid caplike shell also is unlike that of any known mollusk. Association with sclerite-bearing taxa cannot be ruled out, but at present the phylogenetic affiliation of the genus remains equivocal.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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References

Babcock, L. E., and Robison, R. A. 1988. Taxonomy and paleobiology of some Middle Cambrian Scenella (Cnidaria) and hyolithids (Mollusca) from western North America. The University of Kansas Paleontological Contributions, 121:122.Google Scholar
Berg-Madsen, V., and Peel, J. S. 1986. Scenella barrandei (Mollusca) from the Middle Cambrian of Baltoscandia. Norsk Geologisk Tidsskrift, 66:8186.Google Scholar
Billings, E. 1872. On some fossils from the primordial rocks of Newfoundland. Canadian Naturalist, 6:465479.Google Scholar
Checa, A., and Westermann, G. E. G. 1989. Segmental growth planulate ammonites: inferences on costal function. Lethaia, 22:95100.Google Scholar
Conway Morris, S. 1985. The Middle Cambrian metazoan Wiwaxia corrugata (Matthew) from the Burgess Shale and Ogygopsis Shale, British Columbia, Canada. Philosophical Transactions of the Royal Society of London, Series B, Biological Sciences, 307(1134):507586.Google Scholar
Conway Morris, S. 1989. Burgess Shale faunas and the Cambrian explosion. Science, 246:339346.Google Scholar
Conway Morris, S., and Peel, J. S. 1990. Articulated halkieriids from the Lower Cambrian of north Greenland. Nature, 345:802805.Google Scholar
Debrenne, F., and Kruse, P. D. 1986. Shackleton Limestone archaeocyaths. Alcheringa, 10:235278.Google Scholar
Donaldson, A. C. 1962. A patelliform gastropod, Palaelophacmaea criola: a new genus and species from the Lower Ordovician of central Pennsylvania. Proceedings of the West Virginia Academy of Science, 34:143149.Google Scholar
Evans, K. R., and Rowell, A. J. 1990. Small shelly fossils from Antarctica: an Early Cambrian connection with Australia. Journal of Paleontology, 64:692700.Google Scholar
Geyer, G. 1986. Mittelkambrische Mollusken aus Marokko und Spanien. Senckenbergiana Lethaea, 67:55118.Google Scholar
Geyer, G. 1990. Correlation along the Lower/Middle Cambrian boundary—a puzzling story with an elusory end? In Repina, L. N. and Zhuravlev, A. Yu. (eds.), Third International Symposium on the Cambrian System, Abstracts, 100102.Google Scholar
Gil Cid, D. 1988. Nuevos datos sobre la fauna del Cámbrico Inferior (Marianense) de Llerena (Badajoz). Boletin Geológico y Minero, 99:578583.Google Scholar
Hofmann, H. J. 1988. An alternative interpretation of the Ediacaran (Precambrian) chondrophore Chondroplon Wade. Alcheringa, 12:315318.Google Scholar
Kase, T. 1988. Reinterpretation of Brunonia annulata (Yokoyama) as an Early Cretaceous carinariid mesogastropod (Mollusca). Journal of Paleontology, 62:766771.Google Scholar
Kiaer, J. 1916. The Lower Cambrian Holmia fauna at Tømten in Norway. Videnskapsselskapets Skrifter. I. Matematisk-Naturvidenskabelig Klasse, Kristiana, 1916(10):1141.Google Scholar
Knight, J. B. 1941. Paleozoic gastropod genotypes. Geological Society of America Special Paper 32, 510 p.Google Scholar
Knight, J. B., and Yochelson, E. L. 1960. Monoplacophora, p. I77I84. In Moore, R. C. (ed.), Treatise on Invertebrate Paleontology, Part I, Mollusca 1. Geological Society of America and University of Kansas Press, Lawrence.Google Scholar
Neltner, L. 1938. Etudes géologiques dans la sud Marocain (Haut-Atlas et Anti-Atlas). Notes et Mémoires du Service Géologique du Maroc, 42, 298 p.Google Scholar
Pojeta, A. Jr. 1987. Phylum Mollusca. Part I, phylum overview, p. 270293. In Boardman, R. S., Cheetham, A. H., and Rowell, A. J. (eds.), Fossil Invertebrates. Blackwell Scientific Publications, Palo Alto, California.Google Scholar
Pojeta, A. Jr., and Runnegar, B. 1976. The paleontology of rostroconch mollusks and the early history of the phylum Mollusca. U.S. Geological Survey Professional Paper 968, 88 p.Google Scholar
Poulsen, C. 1967. Fossils from the Lower Cambrian of Bornholm. Danske Videnskabernes Selskab, Matematisk-fysiske Meddelelser, 36(2):148.Google Scholar
Rees, M. N., Pratt, B. R., and Rowell, A. J. 1989. Early Cambrian reefs, reef complexes, and associated lithofacies of the Shackleton Limestone, Transantarctic Mountains. Sedimentology, 36:341361.Google Scholar
Rowell, A. J., Evans, K. R., and Rees, M. N. 1989. Fauna of the Shackleton Limestone. Antarctic Journal of the United States, 1988 Review, 23(5):1314.Google Scholar
Rowell, A. J., Rees, M. N., Cooper, R. A., and Pratt, B. R. 1988. Early Paleozoic history of the central Transantarctic Mountains: evidence from the Holyoake Range, Antarctica. New Zealand Journal of Geology and Geophysics, 31:397401.Google Scholar
Runnegar, B., and Jell, P. A. 1976. Australian Middle Cambrian molluscs and their bearing on early molluscan evolution. Alcheringa, 1:109138.Google Scholar
Runnegar, B., and Pojeta, J. Jr. 1974. Molluscan phylogeny: the paleontological viewpoint. Science, 186:311317.Google Scholar
Stanley, G. D. Jr. 1986. Chondrophorine hydrozoans as problematic fossils, p. 6886. In Hoffman, A. and Nitecki, M. H. (eds.), Problematic Fossil Taxa. Oxford Monographs on Geology and Geophysics 5, Oxford University Press.Google Scholar
Stanley, G. D. Jr., and Kanie, Y. 1985. The first Mesozoic chondrophorine (medusoid hydrozoan), from the Lower Cretaceous of Japan. Palaeontology, 28:101109.Google Scholar
Vostokova, V. A. 1962. Kembrijskie gastropody Sibirskoj platformy i Tajmyra [Cambrian gastropods of the Siberian Platform and Tajmyr]. Sbornik Statej po Paleontogii i Biostratigrafii, 28:5174.Google Scholar
Williams, A., and Rowell, A. J. 1965. Morphology, p. H57H155. In Moore, R. C. (ed.), Treatise on Invertebrate Paleontology, Part H, Brachiopoda 1. Geological Society of America and University of Kansas Press, Lawrence.Google Scholar
Wilson, A. E. 1951. Gastropoda and Conularida of the Ottawa Formation of the Ottawa–St. Lawrence lowland. Geological Survey of Canada Bulletin 17, 149 p.Google Scholar
Yochelson, E. L. 1984. North American Middle Ordovician Scenella and Macroscenella as possible chondrophorine coelenterates. Palaeontographica Americana, 10:148153.Google Scholar
Yochelson, E. L., and Gil Cid, D. 1984. Reevaluation of the systematic position of Scenella. Lethaia, 17:331340.Google Scholar
Yochelson, E. L., and Stanley, G. D. Jr. 1981. An Early Ordovician patelliform gastropod, Palaelophacmaea, reinterpreted as a coelenterate. Lethaia, 15:323330.Google Scholar
Wen, Yu and Hui, Ning. 1985. Two Cambrian monoplacophorans from Borohore, Xinjiang. Acta Paleontologica Sinica, 24(1):4750[in Chinese, with an English summary].Google Scholar