Hostname: page-component-586b7cd67f-gb8f7 Total loading time: 0 Render date: 2024-11-22T05:09:53.020Z Has data issue: false hasContentIssue false
  • English
  • Français

Balizoma and the new genera Aegrotocatellus and Perirehaedulus: Encrinurid trilobites from the Douro Formation (Siluiran, Ludlow) of the central Canadian Arctic

Published online by Cambridge University Press:  14 July 2015

Jonathan M. Adrain  and
Gregory D. Edgecombe
Jonathan M. Adrain
Affiliation:
Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada
Gregory D. Edgecombe
Affiliation:
Division of Earth and Environmental Sciences, Australian Museum, P.O. Box A285, Sydney South, NSW 2000, Australia
Get access Rights & Permissions [Opens in a new window]

Abstract

Species of two new genera of Encrinuridae occur in the Ludlow Douro Formation at Goodsir Creek, Cornwallis Island, Gamier Bay, Somerset Island, and Prince Alfred Bay, Devon Island. The encrinurine Aegrotocatellus n. gen. includes four highly autapomorphic species, and is most closely related to Balizoma Holloway, 1980. Separate taxa are recognized at low and high stratigraphic intervals at Goodsir Creek (the type species, Aegrotocatellus jaggeri n. gen. and sp., and Aegrotocatellus n. sp. A, respectively), at Gamier Bay (Aegrotocatellus n. sp. B), and at Prince Alfred Bay (Aegrotocatellus nankerphelgeorum n. gen. and sp.). Perirehaedulus n. gen. is a coronocephaline most closely related to the Chinese upper Llandovery taxon Kailia Chang, 1974. The type species, Perirehaedulus caprus (Thomas in Thomas and Narbonne, 1979) from Goodsir Creek, is distinct from P. richardsi n. gen. and sp. at Garnier Bay. The upper Wenlock–Ludlow range of Balizoma is extended into the Arctic by Balizoma aff. B. variolaris (Brongniart, 1822) from Homerian rocks of the Cape Phillips Formation near Abbott River, Cornwallis Island, and by Balizoma sp., from the late Ludlow Douro Formation at Goodsir Creek.

Type
Research Article
Information
Journal of Paleontology , Volume 69 , Issue 4 , July 1995 , pp. 736 - 752
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

Adrain, J. M. 1994. The lichid trilobite Borealarges n. gen., with species from the Silurian of arctic Canada. Journal of Paleontology, 68:1081–1099.Google Scholar
Angelin, N. P. 1854. Palaeontologica Scandinavica. 1: Crustacea formationis transitionis. Fascicule, 2:21–92.Google Scholar
Bolton, T. E. 1965. Trilobites from Upper Silurian rocks of the Canadian Arctic Archipelago: Encrinurus (Frammia), and Hemiarges . Geological Survey of Canada, Bulletin 134, 14 p.Google Scholar
Brongniart, A. 1822. Les Trilobites, p. 1–65. In Brongniart, A. and Desmarest, A.-G., Histoire Naturelle des Crustacés Fossiles. Paris.Google Scholar
Chang, W.-T. 1974. Silurian Trilobita, p. 173–187. In (Handbook of the Stratigraphy and Paleontology of Southwest China). Edited by the Nanking Institute of Geology and Paleontology, Academica Sinica. Science Press, Beijing. [In Chinese.] Google Scholar
Clarkson, E. N. K., and Henry, J.-L. 1973. Structures coaptatives et enroulement chez quelques Trilobites ordoviciens et siluriens. Lethaia, 6:105–132.Google Scholar
Edgecombe, G. D. 1994. New Lower Silurian (Llandovery) encrinurine trilobites from the Mackenzie Mountains, Canada. Journal of Paleontology, 68:824–837.CrossRefGoogle Scholar
Edgecombe, G. D., and Chatterton, B. D. E. 1987. Heterochrony in the Silurian radiation of encrinurine trilobites. Lethaia, 20:337–351.CrossRefGoogle Scholar
Edgecombe, G. D., and Chatterton, B. D. E. 1990a. Mackenziurus, a new genus of the Silurian “Encrinurus” variolaris plexus (Trilobita). American Museum Novitates, 2968:1–22.Google Scholar
Edgecombe, G. D., and Chatterton, B. D. E. 1990b. Systematics of Encrinuroides and Curriella (Trilobita), with a new Early Silurian encrinurine from the Mackenzie Mountains. Canadian Journal of Earth Sciences, 27:820–833.CrossRefGoogle Scholar
Edgecombe, G. D., and Chatterton, B. D. E. 1992. Early Silurian (Llandovery) encrinurine trilobites from the Mackenzie Mountains, Canada. Journal of Paleontology, 66:52–74.Google Scholar
Edgecombe, G. D., and Chatterton, B. D. E. 1993. Silurian (Wenlock–Ludlow) encrinurine trilobites from the Mackenzie Mountains, Canada, and related species. Palaeontographica (A), 229:75–112.Google Scholar
Edgecombe, G. D., and Ramsköld, L. 1992. The Silurian encrinurine trilobite Pacificurus: new species from North America. Journal of Paleontology, 66:255–262.Google Scholar
Emmrich, H. F. 1844. Zur Naturgeschichte der Trilobiten Meiningen, 28 p.Google Scholar
Holloway, D. J. 1980. Middle Silurian trilobites from Arkansas and Oklahoma, U.S.A. Part 1. Palaeontographica (A), 170:1–85.Google Scholar
Holtedahl, O. 1914. On the fossil faunas from Per Schei's Series B in South western Ellesmereland. Report on the 2nd Norwegian Expedition in the “Fram” 1898–1902, 32:1–48.Google Scholar
Jones, B., and Dixon, O. A. 1977. Stratigraphy and sedimentology of Upper Silurian rocks, northern Somerset Island, Arctic Canada. Canadian Journal of Earth Sciences, 14:1427–1452.Google Scholar
Kerr, A. J. 1975. Cape Storm Formation—A new Silurian unit in the Canadian Arctic. Bulletin of Canadian Petroleum Geology, 23:67–83.Google Scholar
Miall, A. D., and Kerr, J. W. 1978. The Somerset Island Formation: an upper Silurian to ?Lower Devonian intertidal/supratidal succession, Boothia Uplift region, Arctic Canada. Canadian Journal of Earth Sciences, 15:181–189.CrossRefGoogle Scholar
Morrow, D. W., and Kerr, J. W. 1977. Stratigraphy and sedimentology of lower Paleozoic formations near Prince Alfred Bay, Devon Island. Geological Survey of Canada, Bulletin 254, 122 p.CrossRefGoogle Scholar
Ramsköld, L. 1986. Silurian encrinurid trilobites from Gotland and Dalarna, Sweden. Palaeontology, 29:527–575.Google Scholar
Ramsköld, L., and Edgecombe, G. D. 1994. Revision of the Silurian encrinurine trilobite Wallacia Lamont, 1978, with species from Gotland and Canada. Paläontologishche Zeitschrift, 68:89–115.Google Scholar
Reed, F. R. C. 1928. Notes on the Family Encrinuridae. Geological Magazine, 65:51–77.Google Scholar
Salter, J. W. 1852. Geology, p. 217–233. In Sutherland, P. C., Journal of a Voyage in Baffin's Bay and Barrow Straits, in the Years 1850–1851, Volume 2. London.Google Scholar
Schrank, E. 1972. Proetacea, Encrinuridae und Phacopina (Trilobita) aus silurische Geschieben. Geologie Beihefte, 21:1–117.Google Scholar
Strusz, D. L. 1980. The Encrinuridae and related trilobite families, with a description of Silurian species from southeastern Australia. Palaeontographica (A), 168:1–68.Google Scholar
Temple, J. T., and Hong-ji, Wu. 1990. Numerical taxonomy of Encrinuridae (Trilobita): additional species from China and elsewhere. Transactions of the Royal Society of Edinburgh, Earth Sciences, 81:209–219.Google Scholar
Thomas, A. T. 1978. British Wenlock trilobites. Part 1. Palaeontographical Society Monograph, 552:1–56.CrossRefGoogle Scholar
Thomas, A. T. 1981. British Wenlock trilobites. Part 2. Palaeontographical Society Monograph, 559:57–99.Google Scholar
Thomas, A. T., and Narbonne, G. M. 1979. Silurian trilobites from arctic Canada. Geological Magazine, 116:1–19.Google Scholar
Thomas, A. T., Owens, R. M., and Rushton, A. W. A. 1984. Trilobites in British stratigraphy. Special Report of the Geological Society of London, 16:1–78.Google Scholar
Thorsteinsson, R. 1958. Cornwallis and Little Cornwallis Islands, District of Franklin, Northwest Territories. Geological Survey of Canada, Memoir 294, 134 p.Google Scholar
Thorsteinsson, R. 1980. Stratigraphy and conodonts of Upper Silurian and Lower Devonian rocks in the environs of the Boothia Uplift, Canadian Arctic Archipelago. Part I. Contributions to stratigraphy. Geological Survey of Canada, Bulletin 292:1–38.Google Scholar
Tripp, R. P. 1962. The Silurian trilobite Encrinurus punctatus (Wahlenberg) and allied species. Palaeontology, 5:460–477.Google Scholar
Tripp, R. P., Temple, J. T., and Gass, K. C. 1977. The Silurian trilobite Encrinurus variolaris and allied species, with notes on Frammia . Palaeontology, 20:847–867.Google Scholar
Whittington, H. B. 1961. Silurian Hemiarges (Trilobita) from Cornwallis Island and New York State. Journal of Paleontology, 35:433–444.Google Scholar
Whittington, H. B. 1992. Trilobites. Boydell Press, Woodbridge, 145 p.Google Scholar
Whittington, H. B., and Campbell, K. S. W. 1967. Silicified Silurian trilobites from Maine. Bulletin of the Museum of Comparative Zoology, Harvard, 135:447–483.Google Scholar
Wen-tang, Zhang. 1983. On the subfamily Coronocephalinae (Trilobita). Palaeontologica Cathayana, 1:195–257.Google Scholar