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These 300-million-year-old baby fossils just turned a major evolution theory upside down

Ancient fossilized babies of crocodile-like predators are rewriting evolutionary history. Previously, scientists believed early land animals hatched, underwent a tadpole phase, and then transformed, much like modern amphibians. However, new discoveries reveal these early tetrapods skipped the tadpole stage, suggesting their life cycles were more akin to fish or mammals, fundamentally altering our understanding of how life conquered land.

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economictimes.indiatimes.comStai leggendo19 h fa

These 300-million-year-old baby fossils just turned a major evolution theory upside down

Fossils of 300-million-year-old baby embolomeres from Mazon Creek show early tetrapods lacked the tadpole stage present in modern amphibians. The discovery upends the accepted narrative that metamorphosis enabled the water-to-land transition, suggesting instead life cycles resembled fish or humans.

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A New Fossil Discovery Just Rewrote 150 Years of Evolutionary Theory

For 150 years, paleontologists assumed that the first vertebrates to leave the sea for land evolved a tadpole phase, similar to modern frogs. Immaculately-preserved fossils disprove that, scientists say.

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Remarkable fossils rewrite the story of how animals conquered the land

Palaeontologists have found new evidence that the early ancestors of amphibians, reptiles and mammals did not have a larval stage with external gills like modern frogs or salamanders

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Fossils challenge assumptions on how animals adapted to land

Scientists have long posited the earliest water animals to transition to land had amphibious tadpole features, going through a metamorphosis akin to that of today's frogs.

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These 300-million-year-old baby fossils just turned a major evolution theory upside down

Confronto fonti

These 300-million-year-old baby fossils just turned a major evolution theory upside down

A New Fossil Discovery Just Rewrote 150 Years of Evolutionary Theory

Remarkable fossils rewrite the story of how animals conquered the land

Fossils challenge assumptions on how animals adapted to land

Timeline cronologica

Remarkable fossils rewrite the story of how animals conquered the land

A New Fossil Discovery Just Rewrote 150 Years of Evolutionary Theory

Fossils challenge assumptions on how animals adapted to land

These 300-million-year-old baby fossils just turned a major evolution theory upside down

These 300-million-year-old baby fossils just turned a major evolution theory upside down

Confronto fonti

These 300-million-year-old baby fossils just turned a major evolution theory upside down

A New Fossil Discovery Just Rewrote 150 Years of Evolutionary Theory

Remarkable fossils rewrite the story of how animals conquered the land

Fossils challenge assumptions on how animals adapted to land

Timeline cronologica

Remarkable fossils rewrite the story of how animals conquered the land

A New Fossil Discovery Just Rewrote 150 Years of Evolutionary Theory

Fossils challenge assumptions on how animals adapted to land

These 300-million-year-old baby fossils just turned a major evolution theory upside down