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May 21, 2007 · The polar bear (Ursus maritimus) and sea otter (Enhydra lutris) are also often included in the marine mammals, which constitute additional diversity and two additional invasions of the aquatic habitat within the order Carnivora in addition to the Pinnipedia (Berta et al., 2006). Species level identification of most fossils is problematic, so ...
- Mark D. Uhen
- 2007
Figure 1. Harbor seal, walrus, dugong, and right whale) The first mammals were certainly terrestrial. There is good evidence that mammals evolved from reptile-like ancestor. Therefore at some point there was a transition from terrestrial environment to an aquatic lifestyle in this group of species. How did that occur?
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Mar 21, 2012 · When did scientists first propose that marine mammals evolved from land-living mammals? What findings led to this conclusion?
Marine Mammal Diversity. Living groups of marine mammals vary greatly in their diversity. Rice (1998; Table 1 therein) reports that living Cetacea include 83 species in 39 genera; living Pinnipedia include 36 species in 21 genera; and Recent Sirenia include 5 species in 3 genera. Since then, several new spe-cies of cetaceans have been described ...
Oct 18, 2012 · University of California Press, Berkeley, CA. 2012. 205 pp., $49.95 (cloth), $25.62 (Kindle). ISBN 9780520270572. Annalisa Berta leads readers through a vast range of topics regarding the evolution of marine mammals in Return to the Sea: The Life and Evolutionary Times of Marine Mammals. In this volume geared towards non-specialists (one might ...
- Mark D. Uhen
- muhen@gmu.edu
- 2013
The return to the sea: The evolution of marine mammals. : : : Both morphological and molecular data tell us that the ancestors of the marine mammals were terrestrial, and that their various marine lifestyles have evolved independently at least seven times! Each lineage shows shared as well as unique evolutionary solutions to the challenges of ...
Nov 15, 2019 · Convergent morphological adaptations for an aquatic life (e.g., fusiform body shape, flukes and flippers) evolved separately in the three taxonomic orders of extant marine mammals (Artiodactyla [infraorder Cetacea], Carnivora [clade Pinnipedia and sea otters], and Sirenia).
