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Ammonoids at the Triassic-Jurassic Transition: Pulling Back from the Edge of Extinction

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Book cover Ammonoid Paleobiology: From macroevolution to paleogeography

Part of the book series: Topics in Geobiology ((TGBI,volume 44))

Abstract

The Triassic-Jurassic (T-J) extinction significantly affected the evolutionary history of the ammonoids. We use high level taxonomic changes, patterns of generic diversity and differences in morphospace occupation across the Late Triassic to Middle Jurassic interval to provide a sense of the dynamics of the collapse and subsequent recovery. At the superfamily level, the greatest diversity is found in the beginning of the Late Triassic followed by a decline with almost all groups terminated at the T-J boundary. The Psiloceratoidea was the rootstock of the Jurassic recovery, which was rapid, such that the number of co-existing superfamilies from the middle Late Triassic to the end of the Middle Jurassic was fairly consistent, averaging over six per stage. The number of genera per million years steadily declined during the Late Triassic followed by a somewhat erratic increase back to pre-extinction levels throughout the Early and Middle Jurassic. Heteromorphs that virtually disappeared at the T-J boundary, did reappear at comparable diversity levels in the Middle Jurassic. The time to full recovery of Triassic shell disparity was between 30 and 40 million years.

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Correspondence to Louise M. Longridge .

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Longridge, L., Smith, P. (2015). Ammonoids at the Triassic-Jurassic Transition: Pulling Back from the Edge of Extinction. In: Klug, C., Korn, D., De Baets, K., Kruta, I., Mapes, R. (eds) Ammonoid Paleobiology: From macroevolution to paleogeography. Topics in Geobiology, vol 44. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9633-0_18

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