Most Devonian osteolepiforms had strong, stout fins that enabled them to crawl on the muddy bottom of shallow pools.

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Devonian osteolepiforms, which are a group of prehistoric lobe-finned fishes, indeed had strong, stout fins. These fins are thought to have been used for navigating and possibly supporting their bodies in shallow, swampy waters, allowing them to crawl on the muddy bottom. This adaptation is considered an important step in the evolution of tetrapods, the first four-limbed vertebrates and their descendants.

Most Devonian Osteolepiforms Had Strong, Stout Fins That Enabled Them