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Before tetrapods existed, vertebrates were all confined to living in aquatic habitats.
The late Devonian also marked the first tetrapods - vertebrates with true legs that could walk on land.
The first tetrapods , or land-living vertebrates, appeared during the Devonian, as did the first terrestrial arthropods, including wingless insects and the earliest arachnids.
Modern classifications of the tetrapods rely on the structure of the skull.
The city of Toyohashi, Aichi Prefecture, began removing concrete breakwater tetrapods from its shores Monday so sea turtles will be able to come ashore to lay their eggs, municipal officials said.
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