Hostname: page-component-cd9895bd7-q99xh Total loading time: 0 Render date: 2024-12-24T06:21:50.283Z Has data issue: false hasContentIssue false

A medusoid from the Late Ordovician or Early Silurian of Jämtland, central Sweden

Published online by Cambridge University Press:  14 July 2015

Lesley Cherns*
Affiliation:
Department of Geology, University of Wales College of Cardiff, Box 914, Cardiff CF1 3YE, Wales, United Kingdom

Abstract

Patanacta pedina n. gen. and sp. is interpreted as a medusoid from the late Ordovician or early Silurian of Jämtland, central Sweden. The unique specimen is from the Kyrkås Quartzite Formation, a poorly fossiliferous, allochthonous sequence of metasediments in a lower nappe of the frontal zone of the Scandinavian Caledonides. A marginal marine depositional environment is inferred for the Kyrkås facies.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Fedonkin, M. A. 1990. Precambrian metazoans, p. 1724. In Briggs, D. E. G. and Crowther, P. R. (eds.), Paleobiology: A Synthesis. Blackwell Scientific Publications, Oxford, 583 p.Google Scholar
Fürsich, F. T., and Kennedy, W. J. 1975. Kirklandia texana Caster—Cretaceous hydrozoan medusoid or trace fossil chimaera? Palaeontology, 18:665679.Google Scholar
Gee, D. G., and Sturt, B. A. (eds.). 1985. The Caledonide Orogen-Scandinavia and Related Areas. John Wiley & Sons, Chichester, 1,266 p.Google Scholar
Gehling, J. G. 1991. The case for Ediacaran fossil roots to the metazoan tree. Geological Society of India, Memoirs, 20:181223.Google Scholar
Glaessner, M. F. 1984. The Dawn of Animal Life. A Biohistorical Study. Cambridge University Press, Cambridge, 241 p.Google Scholar
Häntzschel, W. 1975. Trace fossils and problematica. In Moore, R. C. (ed.), Treatise on Invertebrate Paleontology, Part W, Supplement 1. Geological Society of America and University of Kansas Press, Lawrence, 269 p.Google Scholar
Harrington, H. J., and Moore, R. C. 1956. Medusae Incertae sedis and unrecognizable forms, p. F153F161. In Moore, R. C. (ed.), Treatise on Invertebrate Paleontology, Part F, Coelenterata. Geological Society of America and University of Kansas Press, Lawrence.Google Scholar
Jin, Y., and Wang, H. 1992. Revision of the Lower Cambrian brachiopod Heliomedusa Sun & Hou, 1987. Lethaia, 25:3549.Google Scholar
Karis, L. 1982. The sequence in the Lower Allochthon of Jämtland, p. 5563. In Bruton, D. L. and Williams, S. H. (eds.), Field Excursion Guide, IV International Symposium on the Ordovician System. University of Oslo, Paleontological Contributions, 279.Google Scholar
Karis, L., and Larsson, K. 1982. Jämtland road-log, p. 6476. In Bruton, D. L. and Williams, S. H. (eds.), Field Excursion Guide, IV International Symposium on the Ordovician System. University of Oslo, Paleontological Contributions, 279.Google Scholar
Lenz, A. C. 1980. A planktic problematicum from the Silurian of northern Yukon, Canada. Journal of Paleontology, 54:584587.Google Scholar
Oliver, W. A. Jr. 1984. Conchopeltis, its affinities and significance. Palaeontographica Americana, 54:141147.Google Scholar
Orlowski, S., and Radwanski, A. 1986. Middle Devonian sea-anemone burrows, Alpertia santacrucensis ichnogen. et ichnosp. n., from the Holy Cross Mountains. Acta Geologica Polonica, 36:233249.Google Scholar
Phillips, J. 1848. Palaeontological appendix to Professor John Phillips' Memoir on the Malvern Hills compared with the Palaeozoic district of Abberley, p. 381386. In Phillips, J. and Salter, J. W., Geological Survey of Great Britain, Memoirs, 2 (Part 1).Google Scholar
Runnegar, B. 1991. Oxygen and the early evolution of the Metazoa, p. 6587. In Bryant, C. (ed.), Metazoan Life without Oxygen. Chapman & Hall, London.Google Scholar
Runnegar, B. 1992. Evolution of the earliest animals, p. 6593. In Schopf, J. W. (ed.), Major Events in the History of Life. Jones and Bartlett Publishers, Boston.Google Scholar
Runnegar, B., and Fedonkin, M. A. 1992. Proterozoic Metazoan body fossils, p. 369388. In Schopf, J. W. and Klein, C. (eds.), The Proterozoic Biosphere. Cambridge University Press, Cambridge.Google Scholar
Seilacher, A. 1984. Late Precambrian and Early Cambrian Metazoa: preservational or real extinctions?, p. 159168. In Holland, H. D. and Trendall, A. F. (eds.), Patterns of Change in Earth Evolution. Springer-Verlag, Berlin.CrossRefGoogle Scholar
Seilacher, A. 1989. Vendozoa: organismic construction in the Proterozoic biosphere. Lethaia, 22:229239.Google Scholar
Spicer, R. A. 1977. The pre-depositional formation of some leaf impressions. Palaeontology, 20:907912.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 University Press, New York.Google Scholar
Strachan, I. 1968. A new medusoid(?) from the Silurian of England. Palaeontology, 11:610611.Google Scholar
Wade, M. 1972. Hydrozoa and Scyphozoa and other medusoids from the Precambrian Ediacara fauna, South Australia. Palaeontology, 15:197225.Google Scholar