Kingdom Animalia  
 Phylum Chordata  
 Class Chondrichthyes  
 Order Carcharhiniformes  
 Family Sphyrnidae  
 Genus Sphyrna  
  Sphyrna zygaena  (Linnaeus, 1758) 
Provider: Pofeng Lee& Shoou-Jeng Joung 
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Synonyms:Sphyrna zigaenaSpyrna zygaenaSqualis pictusSqualus carolinensisSqualus malleusSqualus zygaenaZygaena subarcuataZygaena vulgaris  details
Citation: 臺灣魚類誌(沈等, 1993);中國動物誌-圓口綱及軟骨魚綱(朱等, 2001);FAO Species Catalogue, Vol.4 Sharks of the world
Character: A large hammerhead shark with expanded prebranchial head. Head width 26-29 % of total length. Anterior margin of head very broadly arched with prominent lateral indentations, but no medial indentation. Preoral snout about 1/5 to less than 1/3 of head width. Anterior teeth with moderately long, very stout cusps, and smooth or weakely serrated edges. Posterior teeth mostly cuspidate and not keeled and molariform. First dorsal fin origin over pectoral insertions, its free rear tip well aneterior to pelvic origins. Second dorsal fin low, less than anal fin height, its inner margin long, about twice fin height. Anal fin slightly larger than 2nd dorsal fin. Total vertebral centra 193-206. Colour dark olive or dark grey-brown above, white below, undersides of pectoral fin tips dusky. 
Habitat: An active, common, coastal-pelagic and semi-oceanic hammerhead. Viviparous, with a yolk-sac placenta. Litter size 29-37. Maximum size 370-400 cm. Males maturing at about 210-240 cm and females maturing at about 256. Size at birth 50-61 cm. 
Distribution: Western Atlantic from Scotia to Florida and Virgin Islands. Southern Brazil to southern Argentina. Eastern North Atlantic from Mediterranean and British Isles to Senegal, Cape Verde Islands, Guinea, and Ivory Coast. Western Indian Ocean including South Af 
Utility: This species is caught with pelagic longlines, handlines, and even pelagic and bottom trawls. It is utilized fresh, dried salted, and possibly smoked for human consumption. Hides are processed fro leather. Liver oil is extracted for vitamins. Fins are pro 
Name Code: 383090
      IUCN Red List:VU A2bd     Marine     
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