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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/6359
Title: New skeletal material of Andrewsiphius and Kutchicetus, two Eocene cetaceans from India
Authors: Thewissen J.G.M.
Bajpai, Sunil
Published in: Journal of Paleontology
Abstract: The Eocene cetacean genera Andrewsiphius and Kutchicetus are systematically revised, their anatomy described, and their phylogenetic position analyzed. Each genus contains a single species, A. sloani and K. minimus, and both are known only from the middle Eocene of the Indian Subcontinent. Andrewsiphius and Kutchicetus differ in a number of respects, the most important dental difference being that P2, P3, p2, and p3 are double-rooted in Andrewsiphius and single-rooted in Kutchicetus. Lower molars are separated by diastemata in Kutchicetus, but not in Andrewsiphius. Postcranially, Andrewsiphius has caudal vertebrae that are far more robust than those of Kutchicetus. We propose the new clade Andrewsiphiinae for these two genera, based on their unique characters: the extremely slender jaw, fused mandibular symphysis, narrow palate and rostrum, and lower molars that have a low crown with three cusps lined up rostro-caudally. A phylogenetic analysis indicates that andrewsiphiines are either a subfamily of Remingtonocetidae or an independent branch on the Eocene cetacean lineage. Interpreting conservatively, we classify them as remingtonocetids. Andrewsiphiines have a long, robust, dorso-ventrally flattened tail and short limbs, suggesting that they swam using dorsoventral undulation of the tail. © 2009 The Paleontological Society.
Citation: Journal of Paleontology (2009), 83(5): 635-663
URI: https://doi.org/10.1666/08-045.1
http://repository.iitr.ac.in/handle/123456789/6359
Issue Date: 2009
Keywords: Asia
Cetacea
Eocene
Mammalia
Phylogeny
ISSN: 223360
Author Scopus IDs: 57205523229
16214305000
Author Affiliations: Thewissen, J.G.M., Department of Anatomy, Northeastern Ohio Universities College of Medicine, Rootstown, OH 44272, United States
Bajpai, S., Department of Earth Sciences, Indian Institute of Technology, Roorkee 247667, India
Corresponding Author: Thewissen, J.G.M.; Department of Anatomy, Northeastern Ohio Universities College of Medicine, Rootstown, OH 44272, United States; email: thewisse@neoucom.edu
Appears in Collections:Journal Publications [ES]

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