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The lemon shark was first named and described in 1868 by Felipe Poey. [7] He originally named it Hypoprion brevirostris, but later renamed it Negaprion brevirostris. [7] The lemon shark has also appeared in literature as Negaprion fronto and Carcharias fronto (Jordan and Gilbert, 1882), Carcharias brevirostris (Gunther, 1870), and Carcharhinus brevirostris (Henshall, 1891).
The sicklefin lemon shark usually swims close to the bottom. Courtship behavior - a male (right) follows a female. A sluggish species, the sicklefin lemon shark is usually seen cruising sedately just above the sea bottom or lying still on it, as unlike most requiem sharks, it is capable of actively pumping water over its gills.
The hammer-like shape of the head may have evolved at least in part to enhance the animal's vision. [11] The positioning of the eyes, mounted on the sides of the shark's distinctive hammer head, allows 360° of vision in the vertical plane, meaning the animals can see above and below them at all times.
The name nurse shark is thought to be a corruption of nusse, a name which once referred to the catsharks of the family Scyliorhinidae. The nurse shark family name, Ginglymostomatidae, derives from the Greek words ginglymos (γίγγλυμος) meaning "hinge" and stoma meaning "mouth".
Florida photographer Paul Dabill often sees sharks when he films, but the water being particularly “calm and clear” helped produce "stunning" video.
The shape of the hammerhead shark's head may enhance olfaction by spacing the nostrils further apart. Sharks have keen olfactory senses, located in the short duct (which is not fused, unlike bony fish) between the anterior and posterior nasal openings, with some species able to detect as little as one part per million of blood in seawater.
This shark’s unusual name comes from the unusual shape of its head, an amazing piece of anatomy built to maximize the fish’s ability to find its favorite meal: stingrays. ©frantisekhojdysz ...
Stories tell of men with shark jaws on their back who could change between shark and human form. A common theme was that a shark-man would warn beach-goers of sharks in the waters. The beach-goers would laugh and ignore the warnings and get eaten by the shark-man who warned them. Hawaiian mythology also includes many shark gods.