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Morphology and paleogeography of the Ordovician conodont Paracordylodus gracilis Lindström, 1955: Comparison of two populations

Published online by Cambridge University Press:  20 May 2016

Tatiana Tolmacheva  and
Anita Löfgren
Tatiana Tolmacheva
Affiliation:
1VSEGEI, Sredni prospekt 74, St. Petersburg 199026, Russia; present address: Department of Historical Geology and Palaeontology, Institute of Earth Sciences, Uppsala University, Norbyvägen 22, SE-752 36 Uppsala, Sweden
Anita Löfgren
Affiliation:
2Department of Geology, Sölvegatan 13, SE-223 62 Lund, Sweden
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Abstract

Populations of the widely distributed Early Ordovician conodont Paracordylodus gracilis Lindström, 1955, have been measured and studied in detail. Natural clusters and rich collections of isolated elements allowed calculations of size frequency distributions and construction of survivorship curves. Small morphological differences, as well as dissimilarities in population structure between collections from separate areas, were observed. This led to the recognition of Type A populations from Kazakhstan and other Arenigian warm water, low latitude regions and Type B populations from Baltica and other areas with cool water, mainly located at high latitudes in the Arenigian.

Type
Research Article
Information
Journal of Paleontology , Volume 74 , Issue 6 , November 2000 , pp. 1114 - 1121
Copyright
Copyright © The Paleontological Society

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