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The ontogeny of Failleana and the origin of the Bumastinae (Trilobita)

Published online by Cambridge University Press:  01 May 2009

R. Ludvigsen  and
B. D. E. Chatterton
R. Ludvigsen
Affiliation:
Department of Geology, University of Toronto, Toronto, Ontario M5S 1A1
B. D. E. Chatterton
Affiliation:
Department of Geology, University of Alberta, Edmonton, Alberta T6G 2E1
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Summary

The metaprotaspid of the bumastine Failleana calva is similar to protaspids of scutelluids, whilst late meraspids and early holaspids of F. calva are similar to fully mature styginids. This suggests that the bumastines were derived from the styginids in the Early Ordovician and that the bumastines later gave rise to the scutelluids. Bumastus and similar Silurian trilobites are phyletic derivatives of Ordovician bumastines and not effaced scutelluids as claimed recently by Lane & Thomas. Revised diagnoses of Illaeninae and Bumastinae are presented.

Type
Articles
Information
Geological Magazine , Volume 117 , Issue 5 , September 1980 , pp. 471 - 478
Copyright
Copyright © Cambridge University Press 1980

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References

Bradley, J. H. 1930. Fauna of the Kimmswick Limestone of Missouri and Illinois. Cont. Walker Mus., Chicago 2, 215–90.Google Scholar
Chatterton, B. D. E. in preparation. Ontogenetic studies of Middle Ordovician trilobites from the Esbataottine Formation, District of Mackenzie, Canada. Palaeontographica (A).Google Scholar
Chatterton, B. D. E. & Ludvigsen, R. 1976. Silicified Middle Ordovician trilobites from the South Nahanni River area, District of Mackenzie, Canada. Palaeontographica (A) 154, 1–106.Google Scholar
Hu, C.-H. 1974. Ontogenies of two Middle Ordovician trilobites from the Edinburg Formation, Virginia. Trans. Proc. Palaeont. Soc. Japan N.S. 95, 353–63.Google Scholar
Jaanusson, V. 1954. Zur Morphologie und Taxonomie der Illaeniden. Arkiv f. Mineral. Geol. 1, 545–83.Google Scholar
Jaanusson, V. 1959. Family Illaenidae. In Treatise on Invertebrate Paleontology, Part O. Arthropoda 1 (ed. Moore, R. C.). Geological Society of America and University of Kansas Press (Lawrence).Google Scholar
Lane, P. D. 1972. New trilobites from the Silurian of north-east Greenland, with a note on trilobite faunas in pure limestones. Palaeontology 15, 336–64.Google Scholar
Lane, P. D. & Thomas, A. T. 1978. Silurian trilobites from NE Queensland and the classification of effaced trilobites. Geol. Mag. 115, 351–8.CrossRefGoogle Scholar
Ludvigsen, R. 1978. Towards an Ordovician trilobite biostratigraphy of southern Ontario. In Geology of the Manitoulin area (eds Sanford, J. T. & Mosher, R. E.), Mich. Basin Geol. Soc. Spec. Pap. 3, 73–84.Google Scholar
MacGregor, A. R. 1962. Upper Llandeilo trilobites from the Berwyn Hills, north Wales. Palaeontology 5, 790–816.Google Scholar
Poulsen, V. 1965. An Early Ordovician trilobite fauna from Bornholm. Medd. Dansk Geol. Forening 16, 49–113.Google Scholar
Shaw, F. C. 1968. Early Middle Ordovician Chazy trilobites of New York. New York St. Mus. & Sci. Serv. Mem. 17, 1–162.Google Scholar
Shaw, F. C. 1974. Simpson Group (Middle Ordovician) trilobites of Oklahoma. Paleont. Soc. Mem. 6, 1–54.Google Scholar
Skjeseth, S. 1955. The Middle Ordovician of the Oslo region, Norway, 5. The trilobite family Styginidae. Norsk Geol. Tidsk. 35, 9–28.Google Scholar
Thomas, A. T. 1978. British Wenlock trilobites. Part 1. Palaeontogr. Soc. [Monogr.] 1–56.Google Scholar
Troedsson, G. T. 1928. On the Middle and Upper Ordovician faunas of northern Greenland. Medd. om Grønland 72, 1–197.Google Scholar
Whittington, H. B. 1959. Family Styginidae. In Treatise on Invertebrate Paleontology, Part O. Anthropoda 1 (ed. Moore, R. C.). Lawrence, Kansas: Geological Society of America and University of Kansas Press.Google Scholar
Whittington, H. B. 1965. Trilobites of the Ordovician Table Head formation, western Newfoundland. Bull. Mus. Comp. Zool. 132, 275–441.Google Scholar