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The Late Cambrian (Marjuman) trilobite genus Hysteropleura Raymond from the Cow Head Group, western Newfoundland

Published online by Cambridge University Press:  20 May 2016

Stephen R. Westrop  and
Rolf Ludvigsen
Stephen R. Westrop
Affiliation:
Oklahoma Museum of Natural History and School of Geology and Geophysics, University of Oklahoma, Norman 73019,
Rolf Ludvigsen
Affiliation:
School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 2Y2, Canada [Mailing Address: Denman Institute for Research on Trilobites, 3390 Denman Road, Denman Island, British Columbia V0R 1T0]
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Abstract

Although known previously from only two specimens from northern Greenland, new material from Marjuman boulders in debris flows of the Cow Head Group of western Newfoundland demonstrate that Verditerrina Robison is a menomoniid trilobite that is closely related to Hysteropleura Raymond. Following a parsimony analysis using the PAUP program, Verditerrina is used at the subgeneric level to label a distinctive monophyletic group within Hysteropleura. Three new species are established for the Newfoundland material: Hysteropleura (Verditerrina) adraini, H. (V.) edgecombei and H. (V.) ramskoldi. All three species undergo substantial modification of the anterior border of the cranidium during holaspid ontogeny. Two of the species, H. (V.) adraini and H. (V.) edgecombei, develop elongate, tongue-like borders that are reminiscent of those of calymenids such as Spathocalymene Tillman.

Type
Research Article
Information
Journal of Paleontology , Volume 74 , Issue 6 , November 2000 , pp. 1020 - 1030
Copyright
Copyright © The Paleontological Society

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References

Bremer, K. 1994. Branch support and tree stability. Cladistics, 10:295–304.CrossRefGoogle Scholar
James, N. P., and Stevens, R. H. 1986. Stratigraphy and correlation of the Cambro-Ordovician Cow Head Group, western Newfoundland. Geological Survey of Canada, Bulletin 366, 143 p.Google Scholar
Jones, B. 1988. Biostatistics in paleontology. Geoscience Canada, 15:3–22.Google Scholar
Kindle, C. H. 1982. The C.H. Kindle Collection: Middle Cambrian to Lower Ordovician trilobites from the Cow Head Group, western Newfoundland. Geological Survey of Canada, Paper 82–1C:1–17.Google Scholar
Kindle, C. H., and Whittington, H. B. 1958. Stratigraphy of the Cow Head region, western Newfoundland. Geological Society of America, Bulletin, 69:315–342.CrossRefGoogle Scholar
Lochman, C., and Duncan, D. 1944. Early Upper Cambrian faunas of central Montana. Geological Society of America, Special Paper 54, 181 p.CrossRefGoogle Scholar
Ludvigsen, R., Westrop, S. R., and Kindle, C. H. 1989. Sunwaptan (Upper Cambrian) trilobites of the Cow Head Group, western Newfoundland, Canada. Palaeontographica Canadiana 6, 175 p.Google Scholar
Melzak, A., and Westrop, S. R. 1994. Mid-Cambrian (Marjuman) trilobites from the Pika Formation, southern Canadian Rocky Mountains, Alberta. Canadian Journal of Earth Sciences, 31:969–985.CrossRefGoogle Scholar
Moore, R. C. 1959. Treatise on Invertebrate Paleontology, Part O, Arthopoda 1. Geological Society of America and University of Kansas Press, Lawrence, 560 p.Google Scholar
Palmer, A. R., Cowie, J. W., and Eby, R. G. 1981. A Late Cambrian (Dresbachian, Crepicephalus Zone) fauna from the Boothia Peninsula, District of Franklin. Geological Survey of Canada, Bulletin, 300:1–6.Google Scholar
Pohler, S. L., Barnes, C. R., and James, N. P. 1986. Reconstructing a lost faunal realm: conodonts from megaconglomerates of the Ordovician Cow Head Group, western Newfoundland, p. 341–362. In Austin, R. L. (ed.). Conodonts: Investigative Techniques and Applications. Ellis Horwood Ltd, Chichester, England.Google Scholar
Pratt, B. R. 1992. Trilobites of the Marjuman and Steptoean stages (Upper Cambrian), Rabbitkettle Formation, southern Mackenzie Mountains, northwest Canada. Paleontographica Canadiana, 9, 179 p.Google Scholar
Rasetti, F. 1965. Upper Cambrian trilobite faunas of northeastern Tennessee. Smithsonian Miscellaneous Collections, 148(3), 127 p.Google Scholar
Raymond, P. E. 1937. Upper Cambrian and Lower Ordovician Trilobita and Ostracoda of northwestern Vermont. Geological Society of America Bulletin, 48:1079–1146.CrossRefGoogle Scholar
Robison, R. A. 1964. Late Middle Cambrian faunas from western Utah. Journal of Paleontology, 38:510–566.Google Scholar
Robison, R. A. 1984. Cambrian Agnostida of North America and Greenland, Part 1, Ptychagnostidae. University of Kansas Paleontological Contributions, Paper 109, 59 p.Google Scholar
Robison, R. A. 1988. Trilobites of the Holm Dal Formation (late Middle Cambrian) central North Greenland. Meddelelser om Gr⊘nland, Geoscience, 20:20–103.Google Scholar
Shaw, A. B., 1952. Paleontology of northwestern Vermont II. Fauna of the Upper Cambrian Rockledge Conglomerate near St. Albans. Journal of Paleontology, 26:458–483.Google Scholar
Shaw, A. B. 1966. Paleontology of northwestern Vermont. X. Fossils from the Skeels Corners Formation. Journal of Paleontology, 40:269–295.Google Scholar
Smith, A. B. 1994. Systematics and the Fossil Record. Documenting Evolutionary Patterns. Blackwell Scientific Publications, Boston, 223 p.CrossRefGoogle Scholar
Stitt, J. H., 1998. Trilobites from the Cedarina dakotaensis Zone, lowermost part of the Deadwood Formation (Marjuman Stage, Upper Cambrian), Black Hills, South Dakota. Journal of Paleontology, 72:1030–1046.CrossRefGoogle Scholar
Swofford, D. L. 1993. PAUP: Phylogenetic Analysis Using Parsimony, Version 3.1.1. Computer program distributed by the Illinois Natural History Survey, Champaign, Illinois.Google Scholar
Tillman, C. G. 1960. Spathacalymene, an unusual new Silurian trilobite genus. Journal of Paleontology, 34:891–895.Google Scholar
Walcott, C. D. 1916. Cambrian trilobites. Smithsonian Miscellaneous Collections, 64:157–258.Google Scholar
Westrop, S. R., Ludvigsen, R., and Kindle, C. H. 1996. Upper Cambrian (Marjuman) agnostoid trilobites from the Cow Head Group, western Newfoundland. Journal of Paleontology, 70:804–829.CrossRefGoogle Scholar
Williams, H. 1975. Structural succession, nomenclature and interpretation of transported rock in western Newfoundland. Canadian Journal of Earth Sciences, 12:1874–1894.CrossRefGoogle Scholar
Williams, H., and Hatcher, R. D. 1982. Suspect terranes and accretionary history of the Appalachian orogen. Geology, 10:530–536.2.0.CO;2>CrossRefGoogle Scholar
Young, G. A., and Ludvigsen, R. 1989. Mid-Cambrian trilobites from the lowest part of the Cow Head Group, western Newfoundland. Geological Survey of Canada, Bulletin 392, 49 p.Google Scholar