"Acanthostega" had eight digits on each hand linked by webbing, and six digits on the rear legs. It had no wrists to support the animal's weight on land. "Acanthostega" also had a remarkably fish-like shoulder and forelimb. The front foot of "Acanthostega" could not bend forward at the elbow, and so could not bear the full weight of the body. It was suitable for paddling or for holding on to aquatic plants. The animal had lungs, but its ribs were too short to give support to its chest cavity out of water. It had gills which were internal and covered like those of fish, not external and naked like those of some modern aquatic amphibians.
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