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 Bonnethead (Sphyrna tiburo)

  Index
> Photo
> Range Map
> Systematics
> Name
> Appearance
> Coloration
> Distribution
> Biology
> Feeding
> Size
> Reproduction
> Similar Species
> Endangerment
> Danger to Humans

 Photo

Bonnethead
© Doug Perrine / SeaPics
 Range Map

Earth Map


 Systematics

Phylum: Vertebates (Chordata)

Class: Carlilagenous Fishes (Chondrichthyes)
  Order: Ground sharks (Carcharhiniformes)
    Family: Bonnethead sharks (Sphyrnidae)
      Genus: Sphyrna (Sphyrna)


 Name

Scientific: Sphyrna tiburo
German: Schaufelnasen Hammerhai
English: Bonnethead
French: Requin-marteau tiburo
Spanish: Cornuda tiburo


 Appearance

Very small hammerhead. Unique and very narrow, shovel-shaped head without an indentation on the anterior margin. Origin of first dorsal fin over the inner margins of the pectoral fins. Rear tip of the first dorsal fin ends in front of the pelvic fins.

 Coloration

Grey-brown, white ventral surface.

 Distribution

Western Atlantic: North Carolina to southern Brazil, Cuba and Bahamas, Gulf of Mexico. Eastern Pacific: southern California to Equador.

 Biology

A well studied, abundant hammerhead species. Found close to shore and in shallow water down to about 25 m, maximum of about 80 m. Prefers sandy or muddy bottoms, canals and estuaries. Lives in small groups from 3 to about 15 animals, rarily solitary. Sexual segregation is known. A well studied hammerhead species.

 Feeding

Feeds preferably on crustaceans, shrimp, molluscs and small fishes.

 Size

Average size about 80 cm to 120 cm, maximum total length about 150 cm.

 Reproduction

Viviparous, with yolksac-placenta. Litter size between 4 and 16 pups, most often between 8 to 12 pups. Size at birth between 35 cm to 40 cm. Males reach sexual maturity between 50 cm and 75 cm, females at 85 cm.

 Similar Species

None. The shape of its head is unmistakable.

 Endangerment

Status in the IUCN Red List:


No Entry found in Red List.


 Danger to Humans

Harmless.



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