Lungfish (about 416 MYA)
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Lungfish are freshwater fish, today they only live in Africa, South America, and Australia. The origin of terrestrial locomotion among tetrapods was one of the most important evolutionary achievements to date,. It is widely agreed upon that this adaptation arose in the Devonian period (416 MYA-359 MYA), and that a significant number of morphological alterations to limb structures were required to eventually make this transition from water to land possible.
Insects (about 400 MYA)
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Insect fossils date back 400 million years – they witnessed the rise and fall of the dinosaurs and the evolution of almost every other group of land-based animals. Insects are found in all environments. Some can fly, and some just crawl. Everything we know about ancient life comes from fossils. Insect fossils, however, are very rare. This is because the parts of animals that fossilize well are the hard parts. The most complete evidence we have of ancient insects comes from specimens preserved in amber or fossilized tree sap. Insects occasionally get caught in the sap that drips from trees. Sap hardens over time to form a plastic like substance. An insect trapped in amber will be perfectly preserved for millions of years.