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1 Dorsal fins are found on the back of the fish. 2  There may be up to three of them. 3  The fish uses this fin for balance in the water and sudden movements. 4  Caudal fins are also known as tail fins.5  This is what we refer to as the fish's tail. 6  Anal fins are on the ventral (bottom) surface of the fish, behind the anus. Dorsal fins are found on the back of the fish. 2  There may be up to three of them. 3  The fish uses this fin for balance in the water and sudden movements. 4  Caudal fins are also known as tail fins.
Holoptychius-late Devonian period. The Sarcopterygii. are generally robust osteichthyan fishes with fleshy lobe-fins. They are distinguished from the Actinopterygians or ray-finned fish by their muscular fins with articulating bones.The fins are called lobe fins because they are fleshy and like the limbs of land animals, rather than the fins of familiar ray-finned fish.The lobe fins swivel on a shoulder or hip socket (like a tetrapod limb) and most of the bones can be matched directly to the bones in the limbs of land animals.oloptychius-late Devonian period. The Sarcopterygii. are generally robust osteichthyan fishes with fleshy lobe-fins. They are distinguished from the Actinopterygians or ray-finned fish by their muscular fins with articulating bones.