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    This article has been cited by the following publications. This list is generated based on data provided by CrossRef.
    2017. Graptolite Paleobiology. p. 270.
    Arvestål, Emma H.M. and Streng, Michael 2013. Cyrtograptids from the Telychian (upper Llandovery) of Kinnekulle Mountain, southern Sweden. GFF, Vol. 135, Issue. 1, p. 45.
    Maletz, Jörg 1997. The rhabdosome structure of aSaetograptus species (Graptoloidea, Monograptacea) from a North German glacial boulder. Paläontologische Zeitschrift, Vol. 71, Issue. 3-4, p. 247.
    Loydell, David K. and Cave, Richard 1994. Pseudovirgular development inthe Llandovery Graptolite Cochlograptus veles. Geobios, Vol. 27, Issue. 5, p. 609.
    Lenz, A. C. and Melchin, M. J. 1991. Wenlock (Silurian) graptolites, Cape Phillips Formation, Canadian Arctic Islands. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol. 82, Issue. 03, p. 211.
    Lenz, A. C. and Melchin, M. J. 1989. Monograptus spiralis and its phylogenetic relationship to early cyrtograptids. Journal of Paleontology, Vol. 63, Issue. 03, p. 341.
    Fortey, Richard A. and Bell, Adrian 1987. Branching geometry and function of multiramous graptoloids. Paleobiology, Vol. 13, Issue. 01, p. 1.
    Bjerreskov, Merete 1986. Silurian graptolites from deep well Maglarp 1, Scania, Sweden. Geologiska Föreningen i Stockholm Förhandlingar, Vol. 108, Issue. 1, p. 1.
    Lenz, Alfred C. 1978. Llandoverian and Wenlockian Cyrtograptus,and some other Wenlockian graptolites from Northern and Arctic Canada. Geobios, Vol. 11, Issue. 5, p. 623.
    PALMER, DOUGLAS 1971. THE LUDLOW GRAPTOLITES NEODIVERSO-GRAPTUS NILSSONI AND CUCULLOGRAPTUS (LOBOGRAPTUS) PROGENITOR. Lethaia, Vol. 4, Issue. 4, p. 357.
    RICKARDS, BARRIE 1968. THE THECAL STRUCTURE OF MONOCLIMACIS? GALAENSIS. Lethaia, Vol. 1, Issue. 3, p. 303.
    Bulman, O. M. B. 1958. Patterns of Colonial Development in Graptolites. Journal of the Linnean Society of London, Botany, Vol. 56, Issue. 365, p. 24.
    Bulman, O. M. B. 1958. Patterns of Colonial Development in Graptolites. Journal of the Linnean Society of London, Zoology, Vol. 44, Issue. 295, p. 24.
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The Mode of Cladial Generation in Cyrtograptus

  • R. Thorsteinsson (a1)
Abstract

The morphology of Cyrtograptus rigidus Tullberg n. subsp. A is described from uncompressed material. Particular attention is directed to the sequence of development of the connecting structure of cladium and main branch, which is demonstrated with the aid of figured growth stages of cleared and uncleared specimens. Also discussed is the intimate relationship of relative rate of growth of characters of cladium to those on the main branch. Cursory study of numerous other uncompressed species of Cyrtograptus in the author's collection reveals that the principles of cladial development outlined here are of general application.

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COPYRIGHT: © Cambridge University Press 1955
References
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Bouček, B., 1933. Monographic der obersilurischen Graptolithen aus der Familie Cyrtograptidae. Prace geol. -pal. ust. Karlovy univ., i, Prague.
Bulman, O. M. B., 1951. Notes on Thecal Variation in Monograptus. Geol. Mag., lxxxviii, 316–328.
Elles, G. L., and Wood, E. M., 1901–1918. Monograph of British Graptolites. Palaeontographical Society, London.
Münch, A., 1938. Einige grundlegende Fragen über Bau und Struktur von Monograptus Gein. und Barrandeograptus Bouc. Zeitschr. f. Geschiebeforsch., xiv, 31–70.
Thorsteinsson, R., and Fortier, Y. O., 1954. Report of Progress on the Geology of Cornwallis Island, Arctic Archipelago, Northwest Territories. Geol. Surv. Canada, Prelim. Paper, 53–24.
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Geological Magazine
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