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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/6390
Title: A new Eocene archaeocete (Mammalia, Cetacea) from India and the time of origin of whales
Authors: Bajpai S.
Gingerich P.D.
Published in: Proceedings of the National Academy of Sciences of the United States of America
Abstract: Himalayacetus subathuensis is a new pakicetid archaeocete from the Subathu Formation of northern India. The type dentary has a small mandibular canal indicating a lack of auditory specializations seen in more advanced cetaceans, and it has Pakicetus-like molar teeth suggesting that it fed on fish. Himalayacetus is significant because it is the oldest archaeocete known and because it was found in marine strata associated with a marine fauna. Himalayacetus extends the fossil record of whales about 3.5 million years back in geological time, to the middle part of the early Eocene [?53.5 million years ago (Ma)]. Oxygen in the tooth-enamel phosphate has an isotopic composition intermediate between values reported for freshwater and marine archaeocetes, indicating that Himalayacetus probably spent some time in both environments. When the temporal range of Archaeoceti is calibrated radiometrically, comparison of likelihoods constrains the time of origin of Archaeoceti and hence Cetacea to about 54-55 Ma (beginning of the Eocene), whereas their divergence from extant Artiodactyla may have been as early as 64-65 Ma (beginning of the Cenozoic).
Citation: Proceedings of the National Academy of Sciences of the United States of America (1998), 95(26): 15464-15468
URI: https://doi.org/10.1073/pnas.95.26.15464
http://repository.iitr.ac.in/handle/123456789/6390
Issue Date: 1998
ISSN: 278424
Author Scopus IDs: 16214305000
7006477387
Author Affiliations: Bajpai, S., Department of Earth Sciences, University of Roorkee, Roorkee 247667, Uttar Pradesh, India
Gingerich, P.D., Museum of Paleontology, Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48019-1079, United States
Corresponding Author: Gingerich, P.D.; Museum of Paleontology, Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48019-1079, United States; email: gingeric@umich.edu
Appears in Collections:Journal Publications [ES]

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