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Castorocauda
- One of the first known proto-mammals similar to modern placentals was aquatic, the Jurassic mammaliaform Castorocauda.
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Aquatic mammal. An Amazon river dolphin ( Inia geoffrensis ), a member of the infraorder Cetacea of the order Cetartiodactyla. Aquatic and semiaquatic mammals are a diverse group of mammals that dwell partly or entirely in bodies of water. They include the various marine mammals who dwell in oceans, as well as various freshwater species, such ...
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.
Oct 16, 2018 · Odontoceti: this includes dolphins, killer whales, porpoises, sperm whales and beaked whales. This group is very diverse, its main charcateristic being that they all have teeth. In this group we also find the Amazon river dolphin (Inia geoffrensis), a species of aquatic river mammal.
Although whales are expert swimmers and perfectly adapted to life underwater, these marine mammals once walked on four legs. Their land-dwelling ancestors lived about 50 million years ago. Meet Pakicetus, a goat-sized, four-legged creature that scientists recognise as one of the first cetaceans (the group of marine animals that includes ...
May 21, 2007 · For example, the earliest cetaceans have elongate rostra with their incisors along the rostral body, the earliest pinnipeds have a simplified dentition compared with other arctoids (Mitchell and Tedford, 1973), and the earliest sirenians have a narrow forceps-like snout for selective browsing of aquatic or nearshore vegetation (Savage et al ...
- Mark D. Uhen
- 2007
Previously the earliest was Eomaia, a crown group mammal from about 125M years ago. It had aquatic adaptations including flattened tail bones and remnants of soft tissue between the toes of the back feet, suggesting that they were webbed. Previously the earliest known semi-aquatic mammaliaforms were from the Eocene, about 110M years later.
Marine mammals are mammals that rely on marine (saltwater) ecosystems for their existence. They include animals such as cetaceans ( whales, dolphins and porpoises ), pinnipeds ( seals, sea lions and walruses ), sirenians ( manatees and dugongs ), sea otters and polar bears. They are an informal group, unified only by their reliance on marine ...
