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Cited by 424

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Phylogenetic relationships among cetartiodactyls based on insertions of short and long interpersed elements: Hippopotamuses are the closest extant relatives of whales

Open access
Nikaido, Masato, Rooney, Alejandro P., Okada, Norihiro·1999·Proceedings of the National Academy of Sciences

Abstract

Insertion analysis of short and long interspersed elements is a powerful method for phylogenetic inference. In a previous study of short interspersed element data, it was found that cetaceans, hippopotamuses, and ruminants form a monophyletic group. To further resolve the relationships among these taxa, we now have isolated and characterized 10 additional loci. A phylogenetic analysis of these data was able to resolve relationships among the major cetartiodactyl groups, thereby shedding light on the origin of whales. The results indicated (i) that cetaceans are deeply nested within Artiodactyla, (ii) that cetaceans and hippopotamuses form a monophyletic group, (iii) that pigs and peccaries form a monophyletic group to the exclusion of hippopotamuses, (iv) that chevrotains diverged first among ruminants, and (v) that camels diverged first among cetartiodactyls. These findings lead us to conclude that cetaceans evolved from an immediate artiodactyl, not mesonychian, ancestor.

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Metadata

Authors
Nikaido, M., Rooney, A. P., & Okada, N.
Venue
Proceedings of the National Academy of Sciences
Published
1999-08-31
Volume
96
Issue
18
Pages
10261-10266
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2166860692
Cited by
424
References
4
FWCI
27.89
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Phylogenetic relationships among cetartiodactyls based on insertions of short and long interpersed elements: Hippopotamuses are the closest extant relatives of whales. https://app.cochat.ai/papers/10.1073/pnas.96.18.10261
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Nikaido, M., Rooney, A. P., & Okada, N. (1999). Phylogenetic relationships among cetartiodactyls based on insertions of short and long interpersed elements: Hippopotamuses are the closest extant relatives of whales. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.96.18.10261

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