Shark anatomy - Wikipedia
https://en.wikipedia.org/wiki/Shark_anatomy
OverviewFinsThe five chordate synapomorphiesIdentifying the five synapomorphies in sharksSkeletonTeethInternal organsDigestive systemFins allow the sharks to be able to guide and lift themselves. Most sharks have eight fins: a pair of pectoral fins, a pair of pelvic fins, two dorsal fins, an anal fin, and a caudal fin. Pectoral fins are stiff, which enables downward movement, lift, and guidance. The members of the order Hexanchiformes have only a single dorsal fin. The anal fin is absent in the orders Squaliformes, Squatiniformes, and
DA: 51 PA: 23 MOZ Rank: 30