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1 May 2010 The First Record of the Large Cretaceous Lamniform Shark, Cardabiodon ricki, from North America and a New Empirical Test for Its Presumed Antitropical Distribution
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Abstract
The first occurrence of the lamniform Cardabiodon ricki is reported from the late Cenomanian of Alberta, Canada. Previously, this taxon was described from Australia and Europe and has been hypothesized in the published literature as having an antitropical distribution. Whereas the occurrence of C. ricki in Alberta seemingly supports this hypothesis, no formal methodology exists to determine if Cardabiodon had an antitropical distribution because sampling for Cenomanian fossil elasmobranchs in the tropics is poor. We offer a novel methodology to test the purported hypothesis of an antitropical distribution for Cardabiodon by examining three paleoecological aspects. We compare the range of sea surface temperatures (SST) and paleolatitudinal ranges of Cardabiodon localities to those of the extant antitropical shark, Lamna nasus, because Cardabiodon should exhibit a similar magnitude of thermal and paleolatitudinal ranges to those of L. nasus. Furthermore, the paleodistribution of Cardabiodon localities should shift with climate change. Cardabiodon is concluded to have an antitropical distribution because (1) the SST range for Cardabiodon was only slightly greater (by 1.7°C) than that recorded for L. nasus; (2) the difference in paleolatitude range for Cardabiodon was 10° latitude less than the modern range for L. nasus; and (3) the paleolatitudes of Cardabiodon localities are positively correlated with global temperature to indicate that, during warm periods, Cardabiodon was found at higher paleolatitudes in both hemispheres, but it was found at warmer, lower latitudes during cooler periods.
© 2010 by the Society of Vertebrate Paleontology
Todd D. Cook, Mark V. H. Wilson and Michael G. Newbrey "The First Record of the Large Cretaceous Lamniform Shark, Cardabiodon ricki, from North America and a New Empirical Test for Its Presumed Antitropical Distribution," Journal of Vertebrate Paleontology 30(3), (1 May 2010). https://doi.org/10.1080/02724631003758052
Received: 23 June 2008; Accepted: 1 August 2009; Published: 1 May 2010
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