Скачать или смотреть Fish to Amphibians Evolution Link Fossil

How did life on Earth move from water to land?
One fossil provides some of the strongest geological and paleontological evidence for this transition — Tiktaalik roseae.
In this video, we explore the Late Devonian (≈375 million years ago) evolutionary transition from lobe-finned fishes (Sarcopterygii) to early tetrapods. Tiktaalik is preserved in fluvial and deltaic sedimentary rocks of Ellesmere Island, Canadian Arctic, indicating shallow freshwater environments where early vertebrates experimented with air-breathing and bottom-walking behavior.
This explanation is based on real fossil evidence and comparative anatomy. Tiktaalik displays a remarkable mosaic of features:
Fish-like traits such as cosmoid scales, fin rays, gills, and lateral line systems
Tetrapod-like adaptations including humerus, radius, ulna, wrist-like bones, a true neck due to loss of the opercular bone, robust ribs, and anatomical evidence for lung-based respiration
These skeletal innovations demonstrate stepwise evolutionary adaptation, not sudden transformation. Tiktaalik is not a direct ancestor of modern amphibians, but a transitional tetrapodomorph that bridges earlier fishes like Eusthenopteron and early limbed vertebrates such as Acanthostega.
Fossil preservation in low-energy sedimentary environments and articulated skeletal remains support interpretations of bottom-walking behavior in shallow waters, marking a crucial phase in vertebrate terrestrialization.
This video is ideal for students and enthusiasts of geology, paleontology, evolution, Earth science, and fossil studies.

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