Hostname: page-component-cd9895bd7-7cvxr Total loading time: 0 Render date: 2025-01-05T12:42:13.005Z Has data issue: false hasContentIssue false
  • English
  • Français

Kochiella Poulsen, 1927, and Hadrocephalites new genus (Trilobita: Ptychopariida) from the early Middle Cambrian of western North America

Published online by Cambridge University Press:  14 July 2015

Frederick A. Sundberg  and
Linda B. McCollum
Frederick A. Sundberg
Affiliation:
Las Animas High School, 300 Grove Avenue, Las Animas, CO 81054
Linda B. McCollum
Affiliation:
Department of Geology, Eastern Washington University, Cheney 99004-2499,
Get access Rights & Permissions [Opens in a new window]

Abstract

Kochaspids are an informal group of ptychopariid trilobites that were both abundant and widespread in the early Middle Cambrian of North America. Based on the reassociation of pygidia and cranidia of some kochaspids, Kochiella Poulsen, 1927, is redefined and Hadrocephalites n. gen. is proposed. Hadrocephalites includes taxa previously assigned by Rasetti and Palmer to Schistometopus Resser, 1938a. Schistometopus is considered nomen dubium. Representatives of Kochiella and Hadrocephalites from the Pioche Shale and Carrara Formation of Nevada are described, including the new species Kochiella rasettii, K. brevaspis, Hadrocephalites lyndonensis, and H. rhytidodes. Other kochaspids previously assigned to Kochaspis Resser, 1935; Eiffelaspis Chang, 1963; Schistometopus; and Kochiella are discussed and some are reassigned. The type specimens of Kochiella augusta (Walcott, 1886); K. crito (Walcott, 1917b); K. chares (Walcott, 1917a); K. mansfieldi Resser, 1939; K. arenosa Resser, 1939; Hadrocephalites carina (Walcott, 1917b), and H. cecinna (Walcott, 1917b) are re-illustrated.

Type
Research Article
Information
Journal of Paleontology , Volume 76 , Issue 1 , January 2002 , pp. 76 - 94
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

Chang, W. T. 1963. A classification of the Cambrian trilobites from north and northeastern China, with description of new families and new genera. Acta Palaeontologica Sinica, 11:447–487.Google Scholar
Eddy, J. D., and McCollum, L. B. 1998. Early Middle Cambrian Albertella Biozone trilobites of the Pioche Shale, southeastern Nevada. Journal of Paleontology, 72:864–887.CrossRefGoogle Scholar
Hall, J., and Whitfield, R. P. 1877. Paleontology. United States Geologic Exploration of the 40th Parallel Report, Number 4, Pt. 2, p. 198–302.Google Scholar
Kaesler, R. L. (ed). 1997. Volume 1: Introduction, Order Agnostida, Order Redlichiida. Treatise on Invertebrate Paleontology, Pt. O, Arthropoda 1, Trilobita, Revised. Geological Society of America and University of Kansas Press, New York, 530 p.Google Scholar
Lochman, C. 1948. New Cambrian trilobite genera from northwest Sonora, Mexico. Journal of Paleontology, 22:451–467, pls. 69–70.Google Scholar
Lochman, C. 1956. Stratigraphy, paleontology, and paleogeography of the Elliptocephala asaphoides strata in Cambridge and Hoosick Quadrangles, New York. Geological Society of America Bulletin, 67:1331–1396.CrossRefGoogle Scholar
Matthew, G. F. 1887. Illustrations of the fauna of the St. John Group, Number 4, Pt. 2, The smaller trilobites with eyes (Ptychoparidae and Ellipsocephalidae). Transactions and Proceedings of the Royal Society of Canada, series 2, 5:39–66.Google Scholar
Merriam, C. W. 1964. Cambrian Rocks of the Pioche Mining District, Nevada. U.S. Geological Survey Professional Paper, 469, 59 p.Google Scholar
Moore, R. C. (ed.). 1959. Arthropoda 1. Treatise on Invertebrate Paleontology, Pt. O, Geological Society of America and University of Kansas Press, Lawrence, Kansas, 560 p.Google Scholar
Norford, B. S. 1968. A Middle Cambrian Plagiura-Poliella Faunule from Southwest District of Mackenzie. Geological Survey of Canada Bulletin, 163:29–38, pl. 4–6.Google Scholar
Owen, D. D. 1852. Report of a geological survey of Wisconsin, Iowa, and Minnesota, and incidentally a portion of Nebraska Territory. Lippincott, Grambo & Co., Philadelphia, 638 pp.Google Scholar
Palmer, A. R. 1954. An appraisal of the Great Basin Middle Cambrian trilobites described before 1900. U.S. Geological Survey Professional Paper, 264-D:53–86CrossRefGoogle Scholar
Palmer, A. R. 1958. Morphology and ontogeny of a Lower Cambrian ptychoparioid trilobite from Nevada. Journal of Paleontology 32:154–170.Google Scholar
Palmer, A. R., and Halley, R. B. 1979. Physical stratigraphy and trilobite biostratigraphy of the Carrara Formation (Lower and Middle Cambrian) in the southern Great Basin. U.S. Geological Survey Professional Paper, 1047, 131 p.Google Scholar
Poulsen, C. 1927. The Cambrian, Ozarkian and Canadian faunas of Northwest Greenland. Meddelelser om Gr⊘nland, 70:233–343.Google Scholar
Poulsen, C. 1958. Contribution to the paleontology of the Lower Cambrian Wulff River Formation. Meddelelser om Gr⊘nland, 162(2):1–27Google Scholar
Poulsen, V. 1964. Contribution to the Lower and Middle Cambrian paleontology and stratigraphy of northwest Greenland. Meddelelser om Gr⊘nland, 164(6), 105 p.Google Scholar
Rasetti, F. 1951. Middle Cambrian stratigraphy and faunas of the Canadian Rocky Mountains. Smithsonian Miscellaneous Collections, 116(5), 277 p.Google Scholar
Rasetti, F. 1955. Lower Cambrian ptychopariid trilobites from the conglomerates of Quebec. Smithsonian Miscellaneous Collections, 128(7), 35 p., 6 pls.Google Scholar
Rasetti, F. 1957. Additional fossils from the Middle Cambrian Mt. Whyte Formation of the Canadian Rocky Mountains. Journal of Paleontology, 31:955–972.Google Scholar
Rasetti, F. 1963. Middle Cambrian ptychoparioid trilobites from the conglomerates of Quebec. Journal of Paleontology, 37:575–594, pls. 66–70.Google Scholar
Resser, C. E. 1935. Nomenclature of some Cambrian trilobites. Smithsonian Miscellaneous Collections, 93(5), 29 p.Google Scholar
Resser, C. E. 1936. Second contribution to nomenclature on Cambrian trilobites. Smithsonian Miscellaneous Collections, 95(4), 29 p.Google Scholar
Resser, C. E. 1938a. Middle Cambrian fossils from Pend Oreille Lake, Idaho. Smithsonian Miscellaneous Collections, 97(3), 12 p.Google Scholar
Resser, C. E. 1938b. Cambrian system (restricted) of the southern Appalachians. Geological Society of America Special Paper, 15, 140 p.Google Scholar
Resser, C. E. 1939. The Ptarmigania Strata of the northern Wasatch Mountains. Smithsonian Miscellaneous Collections, 98, 72 p., pls 1–14.Google Scholar
Richter, R. 1933. Crustacea (Paläontologie), p. 840–864; Figs. A, 1–65. In Dittler, R., Joos, G., Korschelt, E., Linek, G., Oltmanns, F., and Schaum, K. (eds.), Handwörtenbuch der Naturwissenschaften (second edition). Gustav Fisher Jena.Google Scholar
Shimer, H. W., and Shrock, R. R. 1944. Index Fossils of North America. Massachusetts Institute of Technology Press, 837 p.Google Scholar
Shaw, A. B. 1957. Quantitative trilobite studies II. Measurement of the dorsal shell of non-agnostidean trilobites. Journal of Paleontology, 31:193–207.Google Scholar
Sundberg, F. A. 1999. Redescription of Alokistocare subcoronatum (Hall and Whitfield, 1877), the type species of Alokistocare, and the status of Alokistocaridae, Resser, 1938b (Ptychopariida: Trilobita, Middle Cambrian). Journal of Paleontology, 73:1126–1143.CrossRefGoogle Scholar
Sundberg, F. A., and McCollum, L. B. 1997. Oryctocephalids (Corynexochida: Trilobita) of the Lower-Middle Cambrian boundary interval from California and Nevada. Journal of Paleontology, 71:1065–1090.CrossRefGoogle Scholar
Sundberg, F. A., and McCollum, L. B. 1999. Biostratigraphic correlation of the Lower-Middle Cambrian boundary interval in the Cordilleran region of Laurentia. Geological Society of America Abstracts and Programs, 31(6):A–100.Google Scholar
Sundberg, F. A., and McCollum, L. B. 2000. Ptychopariid trilobites of the Lower-Middle Cambrian boundary interval, Pioche Shale, southeastern Nevada. Journal of Paleontology, 74:604–630.CrossRefGoogle Scholar
Swinnerton, H. H. 1915. Suggestions for a revised classification of trilobites. Geological Magazine, new series, 2:407–496, 538–545.CrossRefGoogle Scholar
Troelsen, J. C. 1950. Contributions to the geology of northwest Greenland, Ellesmere Island and Axel Heiberg Island. Meddelelser om Gr⊘nland, 149(7), 85 p.Google Scholar
Walch, J. E. I. 1771. Die Naturgeschichte der Versteinerungen, zur Erläuterung der Knorrischen Sammlung von Merkwürdigkeiten der Natur, Volume 4, Pt. 3, Paul Jonathan Felstecker, Nürnberg, 184 p., 81 pls.Google Scholar
Walcott, C. D. 1886. Second contribution to the studies on the Cambrian faunas of North America. U.S. Geological Survey Bulletin, 30:1–369, pl. 1–33.Google Scholar
Walcott, C. D. 1887. Fauna of the “upper Taconic” of Emmons, in Washington County, New York. American Journal of Science, 34:187–199.CrossRefGoogle Scholar
Walcott, C. D. 1890. The fauna of the Lower Cambrian or Olenellus Zone. United States Geological Survey, 10th Annual Report, 1:515–629.Google Scholar
Walcott, C. D. 1908a. Cambrian Brachiopoda: description of new genera and species. Smithsonian Miscellaneous Collections, 53:53–137.Google Scholar
Walcott, C. D. 1908b. Cambrian geology and paleontology, 2, Cambrian trilobites. Smithsonian Miscellaneous Collections, 53(2):13–52.Google Scholar
Walcott, C. D. 1912a. Cambrian Brachiopoda. United States Geological Survey, Monograph, 51(1), 872 p., 76 text-figures; 51(2), 363 p., 104 pls.Google Scholar
Walcott, C. D. 1912b. Cambrian geology and paleontology 2. No. 8: The Sardinian Cambrian genus Olenopsis in America. Smithsonian Miscellaneous Collections, 57(8):239–249, pl. 36.Google Scholar
Walcott, C. D. 1916. Cambrian geology and paleontology of Cambrian trilobites. Smithsonian Miscellaneous Collections, 64(3):157–258Google Scholar
Walcott, C. D. 1917a. The Albertella fauna in British Columbia and Montana. Smithsonian Miscellaneous Collections, 67(2):9–59Google Scholar
Walcott, C. D. 1917b. Cambrian geology and paleontology, 3, fauna of the Mount Whyte Formation. Smithsonian Miscellaneous Collections, 67(3):61–114Google Scholar