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While the earliest known members of the ichthyosaur lineage were more eel-like in build, later ichthyosaurs resembled more typical fishes or dolphins, having a dolphin-like head with a short neck and a long snout. Ichthyosaur fore and hind limbs had been fully transformed into flippers.
The dusky dolphin prefers cool currents and inshore waters, but can also be found offshore. It feeds on a variety of fish and squid species and has flexible hunting tactics. The dusky dolphin is known for its remarkable acrobatics, having a number of aerial behaviours. The status of the dolphin is unknown, but it has been commonly caught in ...
He classified the remains as those of amphibians, because of the presence of dolphin and reptile features, suggesting an intermediate form in between these groups, hence the name. [2] Later, however, he recognized Delphinosaurus as being an ichthyosaur in an 1865 monograph.
Cetacea (/ s ɪ ˈ t eɪ ʃ ə /; from Latin cetus 'whale', from Ancient Greek κῆτος () 'huge fish, sea monster') [3] is an infraorder of aquatic mammals belonging to the order Artiodactyla that includes whales, dolphins and porpoises.
Ichthyosaurs are an important group of extinct Mesozoic marine reptiles. Advanced forms looked remarkably like dolphins. For more, see Ichthyosaur. Subcategories.
It was the ancestor of modern whales, dolphins, and porpoises. The cetacea are extensively adapted to marine life and cannot survive on land at all. Their adaptation can be seen in many unique physiognomic characteristics such as the dorsal blowhole , baleen teeth, and the cranial 'melon' organ used for aquatic echolocation .
Twenty million years ago, Switzerland's low-lying parts were covered in an ocean teeming with fish, sharks and dolphins. Prehistoric dolphin species discovered in landlocked Switzerland Skip to ...
Some extinct marine reptiles, such as ichthyosaurs, evolved to be viviparous and had no requirement to return to land. Ichthyosaurs resembled dolphins. They first appeared about 245 million years ago and disappeared about 90 million years ago.