Some remarks on colony organization in graptolites

• Autorzy: Urbanek A.
• Języki publikacji: EN

Abstrakty

EN

Implications of the presence of perithecal membrane for understanding the degree of integration of graptoloid colonies is discussed. In contrast to Kirk's (1975) opinion that graptoloid colonies can be thought of as a kind of super-individual, a view is advanced that most of morphogenetic functions were delegated to particular zooids. The share of common colonial struotures is too small to consider graptoloid colonies as single individuals. Irregular and localized secretion speaks against the concept of rhabdosome being a preciselly controlled counting device.

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 1978
• Tom: 23
• Numer: 4
• Opis fizyczny: p.631-635,ref.

Twórcy

autor

Urbanek A.

• Institute of Geology, University of Warsaw, Al.Zwirki i Wigury 93, 02-089 Warsaw, Poland

Bibliografia

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• KOZŁOWSKI, R. 1949. Les Graptolithes et quelques nouveaux groupes d'animaux du Tremadoc de la Pologne. - Palaeont. Pol., 3, 1-235.
• URBANEK, A. 1960. An attempt at biological interpretation of evolutionary changes in graptolite colonies. - Acta Palaeont. Pol., 5, 2, 127-234.
• - 1963. On generation and regeneration of cladia in some Upper Silurian monograptids. - Ibidem, 8, 2, 135-254.
• - 1966. On the morphology and evolution of the Cucullograptinae (Monograptidae, Graptolithina). - Ibidem, 11, 3/4, 292-544.
• - 1970. Neocucullograptinae n.subfam. (Graptolithina) - their evolutionary and stratigraphic bearing. - Ibidem, 15, 2/3, 163-388.
• - 1978. Significance of ultrastructural studies for graptolite research. - Acta Palaeont. Pol., 23, 4, 595-629.
• - and TOWE, K. M. 1974. Ultrastructural studies on Graptolites. I. Periderm and its derivatives in Dendroidea and in Mastigograptus. - Smiths. Contr. Paleobiology, 20, 1-48.
• - and -1975. Ultrastructural studies on Graptolites. II. The periderm and its derivatives in the Graptoloidea. - Ibidem, 22, 1-24.