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Elasmobranchii 板鳃亚纲 (鲨鱼与 鱼) (sharks and rays) > Carcharhiniformes (Ground sharks) > Sphyrnidae (Hammerhead, bonnethead, or scoophead sharks)
Etymology: Sphyrna:Probable misspelling of sphyra (Gr.), hammer, referring to their hammer-shaped heads (See ETYFish); lewini:Patronym not identified, perhaps in honor of John Lewin (1770-1819), who illustrated early volumes of Australian natural history (this shark was described from Australia) and may be the “Mr. Lewin” who illustrated the plates in Griffith and Smith’s book (See ETYFish). Eponymy: John William Lewin (1770–1819) was an English naturalist and engraver. [...] (Ref. 128868), visit book page.
Environment: milieu / climate zone / depth range / distribution range
生态学
海洋; 半咸淡水; 海洋洄游的 (Ref. 51243); 深度上下限 0 - 1043 m (Ref. 89972), usually 0 - 25 m (Ref. 26999). 亞熱帶的; 46°N - 39°S, 180°W - 180°E
Circumglobal in coastal warm temperate and tropical seas (Ref. 13562). Western Atlantic: New Jersey, USA to Uruguay (Ref. 58839), including the Gulf of Mexico and Caribbean. Eastern Atlantic: western Mediterranean (Ref. 6678) to Namibia (Ref. 6812). Indo-Pacific: Persian Gulf (Ref. 68964), Red Sea, East Africa and throughout the Indian Ocean; Japan to New Caledonia, Hawaii and Tahiti. Eastern Pacific: southern California, USA to Ecuador, probably Peru. 環球分佈於海岸的暖溫帶與熱帶的海洋.(參考文獻 13562) 西大西洋: 美國的紐澤西到巴西, 包括墨西哥灣與加勒比海。 東大西洋: 地中海 (參考文獻 6678) 到那米比亞.(參考文獻 6812) 印度-太平洋: 紅海, 東非與在印度洋各處; 日本到新加勒多尼亞，夏威夷與大溪地島。 東太平洋: 美國的南加州到厄瓜多, 可能祕魯。
Length at first maturity / 大小 / 重量 / 年龄
Maturity: Lm210.5, range 140 - 273 cm Max length : 430 cm TL 雄鱼/尚未辨别雌雄; (Ref. 26938); common length : 360 cm TL 雄鱼/尚未辨别雌雄; (Ref. 13562); 最大体重: 152.4 kg (Ref. 40637); 最大年龄: 35 年 (Ref. 31395)
背棘 (总数) : 0; 臀棘: 0. This hammerhead shark is distinguished by having the following characters: large, moderately slender body; broad, narrow bladed head, arched anterior margin with prominent median indentation and lateral indentation; nostrils with strong prenarial grooves; hind margins of eyes slightly posterior to or nearly opposite front of mouth; teeth triangular, deeply notched posteriorly, with smooth or finely serrated edges; first dorsal fin moderately high, second dorsal and pectoral fins low; upper precaudal pit transverse crescentric. Colour of body light grey or greyish brown above, shading to white below, pectoral fin tips dusky and a dark blotch on lower caudal fin lobe (Ref. 13562, 114967). 大的 hammerhead 在头部的中心具有一个凹槽; 第一背鳍一般高, 第二背鳍与腹鳍低的.(参考文献 5578) 头部的前缘宽广弓形有突出的中央凹槽。 头部的侧边翼狭窄的, 后缘向后地清扫了.(参考文献 26938) 均匀的灰色，浅灰褐色，或橄榄色的上方, 颜色变化成腹面白色的; 顶端的胸鳍有灰色的或黑色的腹地.(参考文献 13562)
A coastal-pelagic, semi-oceanic shark occurring over continental and insular shelves and adjacent deep water, often approaching close inshore and entering enclosed bays and estuaries (Ref. 244, 11230, 58302). Found in inshore and offshore waters to about 275 m depth (Ref. 26938, 11230, 58302); has been filmed at a baited camera in 512 m depth (Lis Maclaren, pers. comm. 2005). Huge schools of small migrating individuals move pole ward in the summer in certain areas (Ref. 244). Permanent resident populations also exist (Ref. 244). Juveniles occur in coastal areas (Ref. 58784). Adults solitary, in pairs, or schools; young in large schools (Ref. 13562). Feed mainly on teleost fishes and cephalopods (Ref. 6871), also lobsters, shrimps, crabs (Ref. 30573), including other sharks and rays (Ref. 37816). Viviparous (Ref. 50449). Mature females produce 15-31, of 43-55 cm young in a litter (Ref. 26938, 1602). Considered potentially dangerous to people but often not aggressive when approached by divers (Ref. 13562). Readily available to inshore artisanal and small commercial fisheries as well as to offshore operations (Ref. 13562). Sold fresh, dried-salted, smoked and frozen; also sought for its fins and hides (Ref. 9987). Oil used for vitamins and carcasses for fishmeal (Ref. 13562). Maximum depth from Ref. 125614.
Life cycle and mating behavior 成熟度 | 繁殖 | 产卵场 | 卵 | 孕卵数 | 仔鱼
Viviparous, placental (Ref. 50449), with 13-23 in a litter (Ref. 6871); 12-41 pups after a gestation period of 9-10 months (Ref.58048). Size at birth 45-50 cm TL (Ref. 13562); 39-57 cm TL (Ref.58048).環球分佈於海岸的暖溫帶與熱帶的海洋.(參考文獻 13562) 西大西洋: 美國的紐澤西到巴西, 包括墨西哥灣與加勒比海。 東大西洋: 地中海 (參考文獻 6678) 到那米比亞.(參考文獻 6812) 印度-太平洋: 紅海, 東非與在印度洋各處; 日本到新加勒多尼亞，夏威夷與大溪地島。 東太平洋: 美國的南加州到厄瓜多, 可能祕魯。
Compagno, L.J.V., 1984. FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Rome: FAO. (Ref. 244)
