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Fusellar banding in Silurian retiolitid graptolites

Published online by Cambridge University Press:  20 May 2016

A. C. Lenz  and
R. Thorsteinsson
A. C. Lenz
Affiliation:
1Department of Earth Sciences, University of Western Ontario, London, Ontario, Canada N6A 5B7
R. Thorsteinsson
Affiliation:
2Geological Survey of Canada, 3303-33rd Street NW, Calgary, Alberta, Canada T2L 2A7
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Abstract

The study of specimens of the retiolitid graptolites Stomatograptus sp., and Agastograptus robustus with a complete or nearly complete periderm permits a better understanding of the growth and development of retiolitids. Incremental layers deposited in more or less concentric layers on skeletal lists are synchronized with the deposition of sheetlike fusellar bands between the lists. Lists, therefore, become progressively more robust, while the periderm of fusellar bands remain single-layered. It appears that before the development of new distal thecal lists and concomitant deposition of fusellar bands can begin, the next proximal-most thecae must be essentially complete. Retiolitid graptolite thecal growth thus appears to mirror that of “normal” graptolites.

Type
Research Article
Information
Journal of Paleontology , Volume 71 , Issue 5 , September 1997 , pp. 917 - 920
Copyright
Copyright © The Paleontological Society 

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References

Bates, D. E. B. 1988. Les graptolites. La Recherche, Number 205:1476–1482.Google Scholar
Bates, D. E. B., and Kirk, N. H. 1978. Contrasting modes of construction of retiolite-type rhabdosomes. Acta Palaeontologica Polonica, 23:427–448.Google Scholar
Bates, D. E. B., and Kirk, N. H. 1992. The ultrastructure, mode of construction and functioning of a number of Llandovery ancorate diplograptid and retiolitid graptolites. Modern Geology, 17. 270 p.Google Scholar
Bates, D. E. B., Kirk, N. H., Zhao, Yu-Hong, and Loydell, D. 1988. Ultrastructural studies on graptolites using scanning electron microscope. Acta Paleontologica Sinica, 27:527–543. (Chinese and English)Google Scholar
Bouček, B., and Münch, A. 1943. Die Retioliten des mitteleuropaischen Llandovery und unteren Wenlock. Mitteilungen der Tschechischen Akademie der Wissenschaften, 53, 53 p.Google Scholar
Bulman, O. M. B. 1970. Graptolithina with sections on Enteropneusta and Pterobranchia, p. V1–V162. Treatise on Invertebrate Paleontology, Part V. Geological Society of America and University of Kansas Press, Lawrence.Google Scholar
Crowther, P. R. 1981. The fine structure of graptolite periderm. Special Papers in Palaeontology, 26, 119 p.Google Scholar
Holm, G. 1890. Gotlands Graptoliter. Bihang til Kongliga Svenska Vetenskap-Akademiens Handlingar, 16(4), 34 p.Google Scholar
Kozlowska-Dawidziuk, A. 1990. The genus Gothograptus (Graptolithina) from the Wenlock of Poland. Acta Palaeontologica Polonica, 35:191–209.Google Scholar
Kraft, P. 1926. Ontogenetische Entwicklung and Biologie von Diplograptus und Monograptus. Palontologische Zeitschrift, 7:207–249.Google Scholar
Lenz, A. C. 1993. Late Wenlock and Ludlow (Silurian) Plectograptinae (retiolitid graptolites), Cape Phillips Formation, Arctic Canada. Bulletins of American Paleontology, 104, 52 p.Google Scholar
Lenz, A. C. 1994a. Uppermost Wenlock and Lower Ludlow Plectograptinae graptolites, Arctic Islands, Canada: new isolated material. Journal of Paleontology, 68:851–860.Google Scholar
Lenz, A. C. 1994b. A sclerotized retiolitid, and its bearing on the origin and evolution of Silurian retiolitid graptolites. Journal of Paleontology, 68:1344–1349.CrossRefGoogle Scholar
Lenz, A. C., and Melchin, M. J. 1987. Peridermal and interthecal tissue in Silurian retiolitid graptolites, with examples from Sweden and Arctic Canada. Lethaia, 20:353–359.Google Scholar
Mitchell, C. E. 1988. The morphology and ultrastructure of Brevigraptus quadrithecatus n. gen, n. sp. (Diplograptacea), and its convergence upon Dicaulograptus hystrix (Bulman). Journal of Paleontology, 62:448–463.Google Scholar
Perner, J. 1899. Studie o českých graptolitech. Trída II. Monografie graptolitu svrchniho Siluru. Cast III, Oddíl B. Česká Akademie císare Frantiska Josefa pro vedy, slovenost a umení v Praze. Palaeontographica Bohemiae 3(D), 39 p.Google Scholar
Urbanek, A. 1966. On the morphology and evolution of the Cucullograptinae (Monograptidae, Graptolithina). Acta Palaeontologica Polonica, 11:291–544.Google Scholar
Urbanek, A., and Rickards, R. B. 1974. The ultrastructure of some retiolitids and graptoblasts. Special Papers in Palaeontology, 13:176–188.Google Scholar
Walker, M. 1953. The development of Monograptus dubius and Monograptus chimaera. Geological Magazine, 90:362–373.Google Scholar