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- Each taxonomic marine mammal group evolved from a different group of land mammals, whose ancestors separately ventured back into the ocean environment. Despite these different origins, many marine mammals evolved similar features — streamlined bodies, paddle-like limbs and tails — through convergent evolution.
www.noaa.gov › education › resource-collectionsMarine mammals | National Oceanic and Atmospheric Administration
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Do marine mammals have evolutionary histories?
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May 21, 2007 · Each of these evolutionary histories is different from the others in the order in which changes in each anatomical system occurred. Despite this finding, they all have one change in common at the very beginning. The earliest members of each of these clades of marine mammals show adaptations of the feeding apparatus for feeding in water.
- Mark D. Uhen
- 144
- 2007
- 21 May 2007
Apr 16, 2009 · Cetaceans (whales, dolphins, and porpoises) are an order of mammals that originated about 50 million years ago in the Eocene epoch. Even though all modern cetaceans are obligate aquatic mammals, early cetaceans were amphibious, and their ancestors were terrestrial artiodactyls, similar to small deer.
- J. G. M. Thewissen, Lisa Noelle Cooper, Lisa Noelle Cooper, John C. George, Sunil Bajpai
- 2009
ABSTRACT. The fossil record demonstrates that mammals re-entered the marine realm on at least seven separate occasions. Five of these clades are still extant, whereas two are extinct. This review presents a brief introduction to the phylogeny of each group of marine mammals, based on the latest studies using both morphological and molecular data.
A rigorous test for the evolution of marine mammals would use many more species and more characters. But the general result holds: mammals made the transition to water at least three times: in pinnipeds (seals and walruses), in whales, and also in sirenians (dugongs and manatees).
- 1MB
- 15
Jan 26, 2015 · Marine mammals from different mammalian orders share several phenotypic traits adapted to the aquatic environment and therefore represent a classic example of convergent evolution.
- Andrew D Foote, Andrew D Foote, Yue Liu, Gregg W C Thomas, Tomáš Vinař, Jessica Alföldi, Jixin Deng,...
- 2015
Dec 1, 2010 · There was no straight-line march of terrestrial mammals leading up to fully aquatic whales, but an evolutionary riot of amphibious cetaceans that walked and swam along rivers, estuaries and the...
Oct 18, 2012 · A Brief History of Marine Mammals. RETURN TO THE SEA: THE LIFE AND EVOLUTIONARY TIMES OF MARINE MAMMALS. By Annalisa Berta. University of California Press, Berkeley, CA. 2012. 205 pp., $49.95 (cloth), $25.62 (Kindle). ISBN 9780520270572. Book Review. Published: 18 October 2012. Volume 20 , pages 271–272, ( 2013 ) Cite this article. Download PDF.
