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Science

Evolution of terrestrial anatomy revealed by a derived stem tetrapod

Image: Nature

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  • Nature · September 30, 2026 00:00
    Nature, Published online: 30 September 2026; doi:10.1038/s41586-026-11090-6 New anatomical evidence reclassifies Westlothiana as an aquatic stem tetrapod, showing that terrestrial limb adaptations evolved mosaically in transitional amphibious environments before crown tetrapods emerged.