Or more, when necessary. Talk about stasis!
From New Scientist:
Amphibians have been using the same swimming technique for 270 million years, a set of ancient footprints reveals.
“Tracks are very useful because they tell you about the life and activity of an animal,” he says. “Instead of looking at a snapshot you see a movie.” More.
The early amphibian that made the tracks between 270 and 283 mya (Permian period) seems most like a salamander in its movements.
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Modern salamander walking: