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Fins 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 of a shark. A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom.Many species of animals possessing dorsal fins are not particularly closely related to each other, though through convergent evolution they have independently evolved external superficial fish-like body plans adapted to their marine environments ...
The dorsal fins also give the shark advantages. The first dorsal fin helps the spiny dogfish maintain a stable body position while swimming while the second aids in generating thrust. [18] The caudal fin is larger than normal, which helps the sharks maneuver through the water quickly and efficiently. [19]
Steven Reinhardt, 60, of Palm Beach Gardens grins as he shares his shark attack survival story. He sustained a shark bite while on a morning swim on Nov. 5, 2023, near Lost Tree Village in Juno Beach.
There are two dorsal fins: the first dorsal fin is located above the pectoral fins and is significantly taller than the second dorsal fin, which is located above the pelvic fins. Cladoselache was initially considered to lack fin spines, unlike most prehistoric sharks. [10]
The fin spines of reef-dwelling horn sharks are shorter than those living in algal habitats, as their spines become worn down on rocks from the sharks' movements. [3] The first dorsal fin originates over the bases of the large pectoral fins, while the second dorsal fin originates slightly anterior to the free rear tips of the pelvic fins.
In the 1990s, the sharks of the species from the same area averaged only 56.1 kg (124 lb). [11] The species is grey-bronze dorsally and white ventrally. [6] As its name suggests, most of its fins (dorsal, pectoral, pelvic and caudal) have white tips. Along with white tips, the fins may be mottled, and young specimens can have black marks.
Stethacanthus is an extinct genus of shark -like cartilaginous fish which lived from the Late Devonian to Late Carboniferous epoch, dying out around 298.9 million years ago. Fossils have been found in Australia, Asia, Europe and North America.