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Paleontological Journal

, Volume 42, Issue 2, pp 181–191 | Cite as

Evolution of taxonomic diversity in amphiaspids (Agnatha, Heterostraci: Amphiaspidiformes) and the causes of extinction in ecologically favorable conditions

  • L. I. Novitskaya
Article
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Abstract

Changes in the taxonomic composition of Early Devonian amphiaspids represented in Siberia by two assemblages (from the northwestern Siberian Platform and Taimyr) are analyzed. The study is performed at the generic level and represented by diagrams. Changes in the amphiaspid composition are compared with changes in the development of the Taimyr and platform paleobasins. It is shown that shifts in ecological conditions at the stages of extinction of amphiaspids occurred within the limits of changes of abiotic factors (depth, salinity, etc.) that are usual for heterostracans. The disappearance (extinction) of amphiaspids is attributable to the level of their morphological organization, which caused inefficient adaptations to the developing paleoecosystems. The disappearance (extinction) of groups resulting from inadequate vital adaptations to the changing structure of paleoecosystems is considered to be a general law of evolution.

Key words

Agnatha amphiaspids evolution biodiversity adaptive features evolutionary patterns 

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Copyright information

© MAIK Nauka 2008

Authors and Affiliations

  1. 1.Paleontological InstituteRussian Academy of SciencesMoscowRussia

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