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Swiss Journal of Palaeontology

, Volume 130, Issue 1, pp 7–18 | Cite as

Ordovician–Silurian Lilliput crinoids during the end-Ordovician biotic crisis

Article

Abstract

Coincident with the end-Ordovician (end-Katian for crinoids) biodiversity crash, crinoids from Anticosti Island, Quebec, experienced a statistically significant reduction in body size, an evolutionary trend termed the “Lilliput Effect”. This decrease in body size occurred for the fauna as a whole, and data indicate that neither dominant Ordovician nor dominant Silurian clades experienced preferential size decrease. Because the post-extinction fauna with a diminished size is composed of largely new taxa, this example of the Lilliput Effect is regarded as the miniaturization mode. The miniaturization occurred very rapidly; however, the recovery on Anticosti Island did not occur for as many as 7 Ma. This macroevolutionary asymmetry, as demonstrated in many other studies, highlights the need to preserve the biodiversity present on Earth today.

Keywords

Crinoids Ordovician Silurian Extinction Lilliput Effect 

Notes

Acknowledgments

This work was supported by National Geographic Society grant 6789-00 and NSF grant EAR-0205968 to WIA. Careful reviews by George D. Sevastopulo and Gary D. Webster improved this manuscript.

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Copyright information

© Akademie der Naturwissenschaften Schweiz (SCNAT) 2010

Authors and Affiliations

  1. 1.Department of Anatomical SciencesStony Brook UniversityStony BrookUSA
  2. 2.School of Earth SciencesThe Ohio State UniversityColumbusUSA

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