hammerhead shark


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hammerhead shark,

active, surface-living shark, genus Sphyrina. Its curious head has lateral projections resembling the crossbar of a T, and its eyes and ears are located in the outer tips of the projections. This arrangement apparently gives the shark excellent binocular vision, and helps them see above, below, and behind as well as in front. It has been suggested that the extension of the head in the plane of the pectoral fins may give the fish increased lift, but there is no evidence that hammerheads are better swimmers than other sharks. Found in inshore, brackish water, hammerheads are both predators and scavengers. They feed on a variety of fishes including skates, rays, and other hammerheads, and large hammerheads have been known to attack and eat humans without provocation. The largest species is the widely distributed great hammerhead, S. mokarran, which typically reaches 15 ft (4.6 m) in length; the distance between its eyes may be as much as 3 ft (90 cm). The common hammerhead, S. zygaena, is found in all tropical waters, summering as far N as Newfoundland. It may reach a length of 12 ft (3.7 m). The bonnethead, or shovelhead, shark, S. tiburo, is a small, harmless hammerhead found in the W Atlantic from Brazil to Massachusetts. It reaches a length of 5 ft (150 cm) and its lateral lobes are much shorter than in other species, giving the head a rounded appearance. It is notable for eating seagrass as well as crustaceans and other prey. There are several other species distributed throughout tropical and temperate oceans. Hammerhead sharks are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Chondrichthyes, order Selachii, family Sphyrnidae.
References in periodicals archive ?
As previously identified, (317) the scalloped hammerhead shark has
It was not clear what particular species of the hammerhead shark was killed, but the incident was enough for the DENR chief to take action.
A further observation of the prey-handling behavior of the great hammerhead shark, Sphyrna mokarran: Predation upon the spotted eagle ray, Aetobatus narinari.
The International Union for the Conservation of Nature (IUCN) based near Geneva, Switzerland also said that the world's largest fish, the majestic whale shark, and a hammerhead shark species are now endangered.
Shark nets were widely used mainly for harvesting target species of shark like Dog shark, Milk shark, and Hammerhead shark. Sharks were exploited as by catch of Lakkha net in both Chittagong and Cox's Bazar.
SAN DIEGO, Dhu-AlQa'dah 16, 1436, August 31, 2015, SPA -- Swimmers and kayakers are being warned to keep a close eye on the water after an eight- to 10-foot hammerhead shark was spotted lurking near a stretch of beach in La Jolla, according to UPI.
Dubai Aquarium and Underwater Zoo is now home to the smallest members of the hammerhead shark family - the bonnethead or shovelhead sharks.
The aquarium is home to over 2,000 creatures, including a waddling colony of Gentoo penguins, the UK's only hammerhead shark, a rescued Giant Green Sea Turtle, otters, jelly-fish, piranha, octopus and rays.
OGX is now putting its hopes on the development of its Tubaraao Martelo, or "Hammerhead Shark" field.
FAMILY OF PERCENT OF SPECIES SPECIES THREATENED Butterfly fish 0 Marine turtle 100 Eagle ray 50 Pelican 13 Damsel fish Hammerhead shark 57 Sea horse 43 Puffer fish 13 Source: McClenachan et al, 2011 1.