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Discussion of the systematic placement of the Ordovician brachiopod genera Cooperea and Craspedelia by Cocks and Rong (1989)

Published online by Cambridge University Press:  20 May 2016

A. W. Potter
A. W. Potter*
Affiliation:
Department of Geosciences, Oregon State University, Corvallis 97331
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Abstract

Cocks and Rong (1989) subdivided the species of the Ordovician brachiopod genus Bimuria into two groups, those with a simple, or not undercut, cardinal process and those with an undercut cardinal process. They placed the second group in a new genus, Cooperea, and grouped Cooperea with Craspedelia in the new subfamily Craspedeliinae of the family Sowerbyellidae. However, the cardinal process of Bimuria ranges from not undercut to undercut within at least two species. Cooperea is therefore placed in synonymy with Bimuria, and Craspedelia is returned to the Bimuriidae.

Cocks and Rong (1989) inferred that, with rare exceptions, the cardinal process of the Plectambonitacea evolved from simple to trifid to undercut. The evidence from Bimuria indicates, however, that the undercut process developed more than once and, in Bimuria, directly from the simple type.

As an adjunct to the above discussion three new species are described: Bimuria gilbertella, Craspedelia intonsa, and Craspedelia sp. 1. Craspedelia is a rarely reported genus documented here for the first time in western North America (northern California). Additional evidence is introduced that the ratio Lmusbv/Lebv decreased from middle to late Ordovician species of Bimuria.

Type
Research Article
Information
Journal of Paleontology , Volume 65 , Issue 5 , September 1991 , pp. 742 - 755
Copyright
Copyright © The Paleontological Society 

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References

Boucot, A. J., and Gray, J. 1979. Epilogue: a Paleozoic Pangea?, p. 465–482. In Gray, J. and Boucot, A. J. (eds.), Historical Biogeography, Plate Tectonics, and the Changing Environment. Oregon State University Press, Corvallis.Google Scholar
Cocks, L. R. M. 1970. Silurian brachiopods of the superfamily Plectambonitacea. Bulletin of the British Museum (Natural History) (Geology), 19:139–203.Google Scholar
Cocks, L. R. M., and Jia-Yu, Rong. 1989. Classification and review of the brachiopod superfamily Plectambonitacea. Bulletin of the British Museum (Natural History) (Geology), 45:77–163.Google Scholar
Cooper, G. A. 1956. Chazyan and related brachiopods. Smithsonian Miscellaneous Collections, 127, Pt. 1, p. 1–1024, Pt. 2, p. 1025–1245.Google Scholar
Davidson, T. 1866–1871. A monograph of the British fossil Brachiopoda. The Silurian Brachiopoda. Palaeontographical Society, Vol. 3, Pt. 7(1–4), 397 p.Google Scholar
Duméril, A. M. C. 1806. Zoologie Analytique ou Méthode Naturelle de Classification des Animaux. Allais, Paris, 344 p.Google Scholar
Gilbert, W. G. 1981. Preliminary geologic map and geochemical data, Cheeneetnuk River area, Alaska. Alaska Division of Geologic and Geophysical Surveys, Open-file Report, 153:1–10.Google Scholar
Harper, D. A. T. 1989. Brachiopods from the Upper Ardimillan succession (Ordovician) of the Girvan District, Scotland. Part 2. Monograph of the Palaeontographical Society, London(Publication Number 579, part of Volume 142 for 1988):79–128.Google Scholar
Hong-Fei, Hou, and Boucot, A. J. 1990. The Balkhash-Mongolia-Okhotsk Region of the Old World Realm (Devonian). In McKerrow, W. S. and Scotese, C. R. (eds.), Palaeozoic Palaeogeography and Biogeography, Geological Society Memoir, 12:297–303.Google Scholar
Huxley, T. H. 1869. An Introduction to the Classification of Animals. John Churchill and Sons, London, 147 p.Google Scholar
Imbrie, J. 1956. Biometrical methods in the study of invertebrate fossils. Bulletin of the American Museum of Natural History, 108:211–252.Google Scholar
Jaanusson, V. 1962. Two plectambonitacean brachiopods from the Dalby Limestone (Ordov.) [sic] of Sweden. Bulletin of the Geological Institutions of the University of Uppsala, 39:1–9.Google Scholar
Jones, O. T. 1928. Plectambonites and some allied genera. Great Britain, Geological Survey, Memoirs Palaeontology, 1(5):367–527.Google Scholar
Klenina, L. N., Nikitin, I. F., and Popov, L. E. 1984. Brakhiopody i biostratigrafiya srednego i verkhnego Ordovika Khrebta Chingiz. Akademiya Nauka Kazakhskoy SSR, Alma-Ata, 195 p.Google Scholar
Kulkov, N. P., and Severgina, L. G. 1989. Stratigrafiya i brakhiopody ordovika i nizhnego silura Gornogo Altaya. Akademiya Nauk SSSR, Moskva, 223 p.Google Scholar
Mitchell, W. I. 1977. The Ordovician Brachiopoda from Pomeroy, Co. Tyrone. Palaeontographical Society, Monograph, 545, 130:1–138.Google Scholar
Nikitin, I. F., and Popov, L. E. 1984. Brakhiopody bestamakskoy i sargaldakskoy svit (sredniy ordovik), p. 126–166. In Klenina, L. N., Nikitin, I. F., and Popov, L. E., Brakhiopody i biostratigrafiya srednego i verkhnego Ordovika Khrebta Chingiz. Akademiya Nauka Kazakhskoy SSR, Alma-Ata.Google Scholar
Öpik, A. A. 1930. Brachiopoda Protremata der estländischen Ordovizischen Kukruse-Stufe. Acta et Commentationes, Series A, Tartu University, Dorpat, 17:1–262.Google Scholar
Öpik, A. A. 1934. Über Klitamboniten. Acta et Commentationes, Series A, Tartu University, Dorpat, 26:1–239.Google Scholar
Palmer, A. R. 1983. The Decade of North American Geology 1983 geologic time scale. Geology, 11:503–504.Google Scholar
Petrunina, Z. E., and Severgina, L. G. 1962. K stratigrafii ordovika severo-zapada Gornogo Altaya. Materialy po geologii zapadnoy sibiri, Tomsk, Izd-vo, Tom un-ta, 63:81–93.Google Scholar
Popov, L. E. 1980. Novye strofomenidy srednego ordovika severnogo Kazakhstan, p. 54–57. In Stukalina, G. A. (ed.), Novye vidy drevnikh rasteniy i bespozvonochnykh SSSR. ‘Nauka’ 5, Moskva.Google Scholar
Potter, A. W. 1990a. Middle and Late Ordovician brachiopods from the eastern Klamath Mountains, northern California, Part 1. Palaeontographica, Abteilung A, 212:31–158.Google Scholar
Potter, A. W. 1990b. The Ordovician brachiopod genus Bimuria from the eastern Klamath Mountains, northern California. Journal of Paleontology, 64:200–213.Google Scholar
Potter, A. W., Gilbert, W. G., Ormiston, A. R., and Blodgett, R. B. 1980. Middle and Upper Ordovician brachiopods from Alaska and northern California and their paleogeographic implications. Geological Society of America, Abstracts with Programs, 12:147.Google Scholar
Rigby, J. K., Potter, A. W., and Blodgett, R. B. 1988. Ordovician sphinctozoan sponges of Alaska and Yukon Territory. Journal of Paleontology, 62:731–746.Google Scholar
Stewart, J. H., and Palmer, A. R. 1967. Callaghan window—a newly discovered part of the Roberts thrust, Toiyabe Range, Lander County, Nevada. U.S. Geological Survey Professional Paper 575-D:D56–D63.Google Scholar
Ulrich, E. O., and Cooper, G. A. 1942. New genera of Ordovician brachiopods. Journal of Paleontology, 16:620–626.Google Scholar
Williams, A. 1962. The Barr and Lower Ardmillan Series (Caradoc) of the Girvan District, South-west Ayrshire, with descriptions of the Brachiopoda. Geological Society of London, Memoir, 3:1–267.Google Scholar
Williams, A. 1965. Suborder Strophomenidina Opik, 1934, p. H362–H412. In Moore, R. C. (ed.), Treatise on Invertebrate Paleontology, Pt. H, Brachiopoda. Geological Society of America and University of Kansas Press, Lawrence.Google Scholar
Williams, A., and Rowell, A. J., with contributions byAger, D. V., Elliott, G. F., Grant, R. E., Muir-Wood, H. M., and Stehli, F. G. 1965. Morphological terms applied to brachiopods, p. H139–H155. In Moore, R. C. (ed.), Treatise on Invertebrate Paleontology, Pt. H, Brachiopoda. Geological Society of America and University of Kansas Press, Lawrence.Google Scholar