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The effect of the Permo-Triassic bottleneck on Triassic ammonoid morphological evolution

Published online by Cambridge University Press:  08 February 2016

Alistair J. McGowan
Alistair J. McGowan*
Affiliation:
Department of the Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, Illinois 60637
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Abstract

Ammonoid taxonomic history is a well-documented series of diversity “booms and busts”, but the effect of this taxonomic pattern on morphological evolution has not received as much attention. We know particularly little about the effects of the Permo-Triassic mass extinction on the subsequent morphological evolution of the ammonoids.

Morphological data from 322 Triassic ammonoid genera (322 species) were combined with previously published data for Late Paleozoic ammonoids. This data set of 601 specimens was subjected to PCA to assess (1) the effects of the Permo-Triassic taxonomic bottleneck on ammonoid morphological evolution, by comparing the strength and sign of correlations in the Paleozoic and in the Triassic, and (2) whether the Triassic ammonoids immediately shifted to Jurassic morphologies, retained Paleozoic morphologies, or evolved in a more “mosaic” fashion.

The Triassic ammonoids recapitulate the late Paleozoic W-D distribution, but in S-D space their distribution closely foreshadows that of the Lower Jurassic ammonites. Given these findings it is clear that at even the level of shell geometry the Triassic ammonoids evolved in a mosaic fashion

The Triassic ammonoids reoccupy, and extend, the volume of morphospace occupied by the Paleozoic ammonoids. Overall, Triassic correlations between pairs of characters are weaker, but not significantly so.

Type
Articles
Information
Paleobiology , Volume 30 , Issue 3 , Summer 2004 , pp. 369 - 395
Copyright
Copyright © The Paleontological Society 

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