Ammonoid recovery from the Late Permian mass extinction event

Alistair J. MCGOWAN

en Comptes Rendus Palevol 4 (6-7) - Pages 517-530

Published on 31 October 2005

This article is a part of the thematic issue The Triassic recovery, the dawn of the modern biota

Previous research indicated that ammonoid taxonomic diversity exploded after the Late Permian mass extinction, regaining pre-extinction levels by the Late Induan (Dienerian substage). From taxonomic analyses it had been inferred that ammonoids recovered rapidly, relative to other marine invertebrate groups. Complementing taxonomic metrics with morphologic and spatial data revealed more complex recovery dynamics. Morphological analysis indicated that ammonoids did not fully recover until the Spathian or Anisian. Taxonomic diversity is a poor predictor of disparity during the recovery. Spatial partitioning of taxonomic and morphological diversity revealed spatially homogeneous recovery patterns. Combining taxonomic, morphological, and spatial data refined interpretations of Triassic ammonoid recovery patterns and indicated that ecological, not intrinsic, factors were the probable control on ammonoid recovery rates.


Triassic, Ammonoids, biotic recovery, biogeography

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