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aquatic adaptation
Several animal groups have undergone aquatic adaptation, going from being purely terrestrial animals to living at least part of the time in water. The adaptations in early speciation tend to develop as the animal ventures into water in order to find available food. As successive generations spend more time in the water, natural selection causes the acquisition of more adaptations. Animals of later generations may spend the majority of their life in the water, coming ashore for mating. Finally, fully adapted animals may take to mating and birthing in water.
==Anapsid==
(詳細はArchelon'' is a type of giant sea turtle dating from the Cretaceous Period, now long extinct. Its smaller cousins survive as the sea turtles of today.
''Mesosaurus'' (and other mesosaurids) were another group of anapsid reptiles to secondarily return to the sea, eschewing shells, and are also long extinct.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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