Sealife guideThe scalloped hammerheadSphyrna lewini

Last updated on 03/29/2025 at 12:35 AM
Taxonomy
  • Common name: Scalloped hammerhead
  • French name: Requin marteau halicorne
  • Spanish name: Tiburón martillo,cornuda común
  • Scientific name: Sphyrna lewini (Griffith & Smith, 1834)
  • Family name: Sphyrnidae
  • Order name: Carcharhiniformes
  • Class name: Elasmobranchii
Description
The scalloped hammerhead shark is a medium-sized shark species, typically measuring 6.5 to 10 feet in length, with the largest specimens reaching up to 13 feet. Its body color ranges from gray to brownish on the back and whitish on the belly. The first dorsal fin is large and triangular, while the second one is very small. As the shark ages, the tips of its pectoral fins darken, along with the tip of the lower lobe of the tail.
The scalloped hammerhead (Sphyrna lewini)
The scalloped hammerhead (Sphyrna lewini) ©  | Dreamstime.com
The scalloped hammerhead shark's head has a distinctive T-shape, which gives it its name of hammerhead shark, but with a front edge that is slightly more curved than the great hammerhead shark and a well-defined notch in the center.
Geographic range
The scalloped hammerhead shark is a coastal shark that inhabits warm, temperate, and tropical waters of the Atlantic, Pacific, and Indian oceans.
The scalloped hammerhead shark is found along the eastern Pacific coast from California to Peru, along the western Atlantic coast from New Jersey to Brazil, including the Gulf of Mexico and the Caribbean Sea. It also inhabits waters from Japan to Tahiti, nearly the entire African coastline, from the Mediterranean to Namibia on the west coast, and from the Red Sea to South Africa on the east coast
Habitat
The scalloped hammerhead shark is found above continental and insular shelves, around seamounts, and near coral reefs, at depths of up to 900 feet. This species is highly gregarious, often forming large schools of over 100 individuals, though smaller groups of 10 to 50 sharks are also common. Occasionally, the scalloped hammerhead can also be observed solitary.
Juvenile scalloped hammerhead sharks typically inhabit shallow coastal waters, while adults prefer deeper offshore waters.
The scalloped hammerhead shark regularly makes deep nocturnal dives, reaching depths recorded by scientists of over 2,950 feet, with a record of 4,070 feet for a female tracked in Hawaii.
Diet
The scalloped hammerhead shark has a varied diet, feeding on fish, cephalopods such as squids and octopuses, which it hunts at great depths, as well as, to a lesser extent, crustaceans like crabs and shrimp.
They can also feed on other sharks, including members of their own species, and show a particular preference for stingrays, being apparently immune to their venomous spines.
Reproduction
The scalloped hammerhead shark is a viviparous species, with females giving birth after a gestation period ranging from 8 to 12 months. They give birth to litters of 15 to 40 pups, measuring between 14 and 22 inches at birth.
The nursery areas are typically located in very shallow waters, providing a protected environment for the growth of the juveniles. Males reach sexual maturity at around 8 to 10 years, while females become mature between 12 and 15 years.
Females show site fidelity to certain coastlines and breeding areas, and do not engage in oceanic migrations.
Did you know ?
The longevity of the scalloped hammerhead shark can reach up to 30 years.
The scalloped hammerhead is listed as many other marine species within The IUCN Red List of threatened species. The scalloped hammerhead appears in the IUCN Red List since 2019 within the category Critically Endangered !
Within the same genus
Bonnethead shark (Sphyrna tiburo)
Bonnethead shark
(Sphyrna tiburo)
Great hammerhead shark (Sphyrna mokarran)
Great hammerhead shark
(Sphyrna mokarran)
Within the same family
Hammerhead shark (9 espèces)
Hammerhead shark
(9 espèces)
Discover also
Copper shark (Carcharhinus brachyurus)
Copper shark
(Carcharhinus brachyurus)
Grey reef shark (Carcharhinus amblyrhynchos)
Grey reef shark
(Carcharhinus amblyrhynchos)
Oceanic whitetip shark (Carcharhinus longimanus)
Oceanic whitetip shark
(Carcharhinus longimanus)
Ornate wobbegong (Orectolobus ornatus)
Ornate wobbegong
(Orectolobus ornatus)
Pelagic thresher shark (Alopias pelagicus)
Pelagic thresher shark
(Alopias pelagicus)
Pyjama shark (Poroderma africanum)
Pyjama shark
(Poroderma africanum)
Short fin mako (Isurus oxyrinchus)
Short fin mako
(Isurus oxyrinchus)
Spiny dogfish (Squalus acanthias)
Spiny dogfish
(Squalus acanthias)
The marine species
Black scorpionfish (Scorpaena porcus)
Black scorpionfish
(Scorpaena porcus)
Giant hawkfish (Cirrhitus rivulatus)
Giant hawkfish
(Cirrhitus rivulatus)
Ornate wrasse (Thalassoma pavo)
Ornate wrasse
(Thalassoma pavo)
Pink sea slug (Flabellina affinis)
Pink sea slug
(Flabellina affinis)
Red sea-squirt (Halocynthia papillosa)
Red sea-squirt
(Halocynthia papillosa)
Spotted goatfish (Pseudupeneus maculatus)
Spotted goatfish
(Pseudupeneus maculatus)
Spotted spiny lobster (Panulirus guttatus)
Spotted spiny lobster
(Panulirus guttatus)
Yellowmargin triggerfish (Pseudobalistes flavimarginatus)
Yellowmargin triggerfish
(Pseudobalistes flavimarginatus)

Our latestUpdates

Hvar island
Friday, January 10th 2025
Hvar island
Hvar, a jewel of the Adriatic, captivates with its turquoise waters, wild coves and fragrant lavender fields. Between medieval villages, lively ports, and lush hills, Hvar island offers the perfect mix of relaxation, culture and breathtaking landscapes. Ideal for sun, sea and authentic experiences.
The lemonpeel angelfish
Thursday, January 9th 2025
The lemonpeel angelfish
The lemonpeel angelfish is a small, brightly colored reef fish found in the tropical waters of the Indo-Pacific ocean. It inhabits shallow coral reefs, sheltering among corals and rocky crevices.
The magic of Christmas decorations
Friday, December 19th 2025
The magic of Christmas decorations
Discover Christmas decorations in Florida: giant trees, illuminated palm trees, magical light displays and tropical settings to experience the holiday magic under the sun.
Photo of the Day
Méduse rayonnée (Chrysaora hysoscella)
Méduse rayonnée
(Chrysaora hysoscella)