An unpaired fin on the back of a fish or whale, e.g. the tall triangular fin of a shark or killer whale.
- It has two dorsal fins and a caudal fin or tail like that of a shark.
- They have one caudal fin, one dorsal fin, two pelvic fins, one anal fin, and two pectoral fins.
- This is the pattern seen in the dorsal fins of fishes, in Dimetrodon and among iguanid lizards.
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