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The Upper Cambrian trilobites Plethopeltis and Leiocoryphe: Morphology, paedomorphism, classification

Published online by Cambridge University Press:  14 July 2015

Harry B. Whittington
Harry B. Whittington*
Affiliation:
Sedgwick Museum, Department of Earth Sciences, University of Cambridge, CB2 3EQ, United Kingdom
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Abstract

Plethopeltis armatus, and species of Leiocorpyphe, are shown to have in common a median ventral cephalic suture and thoracic axial rings with a poorly-defined articulating furrow and a strong transverse ventral ridge. In other characters they differ greatly, and to group them in the Plethopeltidae is open to question; this family may be polyphyletic. The median ventral suture is regarded as a cardinal character of Asaphida, but it is uncertain whether this character had a single origin or arose more than once. Leiocoryphe gemma may be a paedomorphic species derived from some Upper Cambrian trilobite with an effaced cephalon.

Type
Research Article
Information
Journal of Paleontology , Volume 77 , Issue 4 , July 2003 , pp. 698 - 705
Copyright
Copyright © The Paleontological Society

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References

Billings, E. 1860. On some new species of fossils from the limestone near Point Levi, opposite Quebec. Canadian Naturalist and Geologist, 5:301–324.Google Scholar
Bridge, J. 1931. Geology of the Eminence and Cardareva Quadrangles. Missouri Bureau of Geology and Mines, Volume 24, 2nd series, 228 p., 22 pls. (Date on cover of publication is 1930. Knight, J. B., 1941, Special Paper 32, Geological Society of America, p. 403, states that the date of publication was March, 1931).Google Scholar
Clark, M. G., and Shaw, A. B. 1968. Paleontology of northwestern Vermont XVI. Trilobites of the Upper Cambrian Gorge Formation (Upper bed 3). Journal of Paleontology, 42:1014–1026.Google Scholar
Clark, T. H. 1924. The paleontology of the Beekmantown Series at Levis, Quebec. Bulletins of American Paleontology, 10(41):134 p.Google Scholar
Fortey, R. A. 1990. Ontogeny, hypostome attachment and trilobite classification. Palaeontology, 33:529–576.Google Scholar
Fortey, R. A., and Chatterton, B. D. E. 1988. Classification of the trilobite Suborder Asaphina. Palaeontology, 31:165–222.Google Scholar
Hu, Chung-Hung. 1975. Ontogenies of three late Cambrian trilobites from the Deadwood Formation, northern Black Hills, South Dakota. Bulletin of American Paleontology, 67:251–272.Google Scholar
Hu, Chung-Hung. 1986. Ontogenetic development of Cambrian trilobites from British Columbia and Alberta, Canada, Pt. 2. Journal of Taiwan Museum, 39:1–44.Google Scholar
Hupé, P. 1955. Classification des trilobites (continued). Annales de Paléontologie, 41:111–345.Google Scholar
Kaesler, R. L. (ed.). 1997. Treatise on Invertebrate Paleontology, Pt. O, Arthropoda 1, Trilobita, Revised, Volume 1. Geological Society of America and University of Kansas Press, Lawrence, 530 p.Google Scholar
Ludvigsen, R., and Westrop, S. R. 1983. Franconian trilobites of New York State. New York State Museum, Memoir 23, 82 p.Google 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, 174 p.Google Scholar
McNamara, K. J. 1983. Progenesis in trilobites. Special Papers in Palaeontology, the Palaeontological Association, 30:59–68.Google Scholar
Miller, B. M. 1936. Cambrian trilobites from northwestern Wyoming. Journal of Paleontology, 10:23–34.Google Scholar
Moore, R. C. 1959. Treatise on Invertebrate Paleontology, Pt. O. Arthropoda 1. Geological Society of America and University of Kansas Press, Lawrence, 560 p.Google Scholar
Öpik, A. A. 1967. The Mindyallan Fauna of north-western Queensland. Bureau of Mineral Resources, Geology and Geophysics, Commonwealth of Australia, Bulletin 74: Volume 1, text, 404 p.; Volume 2, plates, 167 p.Google Scholar
Palmer, A. R., and Gatehouse, C. G. 1972. Early and Middle Cambrian trilobites from Antarctica. U.S. Geological Survey professional Paper 456D, 37 p., 6 pl.Google Scholar
Palmer, A. R., and Peel, J. S. 1981. Dresbachian trilobites and stratigraphy of the Cass Fjord Formation, western North Greenland. Grønlands Geologiske Undersøgelse, Bulletin 141, 46 p., 5 pl.CrossRefGoogle Scholar
Rasetti, F. 1944. Upper Cambrian trilobites from the Lévis conglomerate. Journal of Paleontology, 18:229–258.Google Scholar
Rasetti, F. 1945a. New Upper Cambrian trilobites from the Lévis conglomerate. Journal of Paleontology, 19:462–478.Google Scholar
Rasetti, F. 1945b. Description supplémentaire de trois genres de trilobites Cambrien. Naturaliste Canadien, 72:117–124.Google Scholar
Rasetti, F. 1952. Ventral cephalic sutures in Cambrian trilobites. American Journal of Science, 250:885–898.CrossRefGoogle Scholar
Rasetti, F. 1959. Trempealeauian trilobites from the Conococheague, Frederick and Grove limestones of the central Appalachians. Journal of Paleontology, 33:375–398.Google Scholar
Rasetti, F. 1963. Additions to the Upper Cambrian fauna from the conglomerate boulders at Levis, Quebec. Journal of Paleontology, 37:1009–1017.Google Scholar
Raymond, P. E. 1924. New Upper Cambrian and Lower Ordovician trilobites from Vermont. Proceedings of the Boston Society of Natural History, 37:389–466, pls. 12–14.Google Scholar
Raymond, P. E. 1925. New Upper Cambrian and Lower Ordovician trilobites from Vermont. Republished from 1924 with amendments in the Fourteenth Biennial Report of the Vermont State Geologist, 1923–1925, p. 137–208.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
Shergold, J. H. 1991. Late Cambrian and Early Ordovician faunas of the Pacoota Sandstone, Amadeus Basin, Central Australia. Bureau of Mineral Resources, Geology and Geophysics, Commonwealth of Australia, Bulletin 237:15–75.Google Scholar
Walcott, C. D. 1890. Description of new forms of Upper Cambrian fossils. Proceedings of the United States National Museum, 13:267–279.CrossRefGoogle Scholar
Walcott, C. D. 1924. Cambrian Geology and Paleontology. V, no. 2. Cambrian and Lower Ozarkian trilobites. Smithsonian Miscellaneous Collections, 75:53–60.Google Scholar
Westrop, S. R. 1986. Trilobites of the Upper Cambrian Sunwaptan Stage, southern Canadian Rocky Mountains, Alberta. Palaeontographica Canadiana, 3:178 p.Google Scholar
Whittington, H. B. 1997. Illaenidae (Trilobita): morphology of thorax, classification and mode of life. Journal of Paleontology, 71:878–896.CrossRefGoogle Scholar