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Evolution of Marine Mammals: Back to the Sea After 300 Million Years MARK D. UHEN* Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC ABSTRACT The fossil record demonstrates that mammals re-entered the marine realm on at least seven separate occasions. Five of these clades are still
- Mark D. Uhen
May 21, 2007 · A recurrent theme in tetrapod evolution is a return to an aquatic habitat. Whereas amphibians never quite parted with the water, all other tetrapod groups (reptiles, birds, and mammals) have several representatives that have returned to the water for at least an amphibious lifestyle of some degree, if not a fully aquatic existence.
- Mark D. Uhen
Jan 01, 2009 · These phylogenies are meant to give the non-specialist an introduction to the confusing array of systematic names of marine mammals by providing a family attribution, an approximate phylogenetic position, and an approximate age range for many genera. They do not represent a conclusive, or even consensus, view of marine mammal evolution.
- J.G.M. Thewissen, Bobbi Jo Schneider
Evolution of marine mammals. Three mammal groups are water-dwelling animals: the cetaceans ( whales, dolphins and porpoises ), the sirenians ( manatees and dugongs) and the pinnipeds ( seals, sea lions and walruses ). Quite independently, animals from each of these groups evolved bodies designed for survival in the water.
Case Studies in Ecology and Evolution DRAFT D. Stratton 2011 1 1 Phylogenetic History: The Evolution of Marine Mammals Think for a moment about marine mammals: seals, walruses, dugongs and whales. Seals and walruses are primarily cold-water species that eat mostly fish and can spend part of their time on land (or ice).