Fish fin
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Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and lift, which help the fish swim. Apart from the tail or caudal fin, fish fins have no direct
Skeleton of a lingcod, a ray-finned fish
Lobe-finned fishes, like this coelacanth, have fins that are borne on a fleshy, lobe-like, scaly stalk extending from the body. Due to the high number of fins it possesses, the coelacanth has high manoeuvrability and can orient its body in almost any direction in the water.
Pectoral fin with fleshy lobe of Latimeria chalumnae (Citron / CC-BY-SA-3.0)
Skeleton of the pectoral girdle and fin of the extant coelacanth Latimeria chalumnae (Citron / CC-BY-SA-3.0)
Shark
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Sharks are a group of elasmobranch cartilaginous fishes characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the he
Fish fin
…also be used for other purposes: remoras and gobies have evolved sucker-like dorsal and pelvic fins for attaching to surfaces and "hitchhiking"; male sharks and mosquitofish use modified pelvic fins known as claspers to deliver semen during mating; thresher sharks use their caudal fin to whip and stun prey…
Corl 0207
Fossil shark tooth (size over 9 cm or 3.5 inches) with crown, shoulder, root and root lobe
A collection of Cretaceous shark teeth
The teeth of tiger sharks are oblique and serrated to saw through flesh