Sphyrna


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Related to Sphyrna: Trygon, Sphyrna tiburo, Sphyrna zygaena

Sphyrna

 

the sole genus of the family Sphyrnidae (hammer-head sharks). The head is hammer-shaped, with eyes located on the end of its large lateral extensions. The body is up to 6 m long and weighs up to 450 kg. There are nine species of hammerheads, distributed in the warm waters of all oceans. The smooth hammerhead (Sphyrna zygaena) enters moderately Warm seas in the summer and has been observed near the shores of the Primor’e. Hammerheads are viviparous, bearing as many as 40 young. They feed mainly on benthic fishes and invertebrates. Large hammerheads are harmful to man. The sharks are of minor commercial value.

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The species of the genus Sphyrna are usually identified in longline fishing logbooks only as "hammerhead", which hinders the understanding of their geographic distribution, abundance, and importance in fisheries catches, thus contributing to a higher risk for these species (Gallagher et al.
La especie Sphyrna media se registra en el Pacifico mexicano y es la unica que habita en ambos litorales del continente americano; sin embargo, su distribucion en el Atlantico occidental se restringe al sur del istmo de Panama y se requiere un estudio que formalice su posicion taxonomica.
Kajiura SM, Tyminski JP, Forni JB, Summers AP (2005) The Sexually Dimorphic Cephalofoil of Bonnethead Sharks, Sphyrna tiburo.
Age and growth studies of Sphyrna lewini have been carried out at a regional level throughout the world by several authors (Chen et al.
Sinonimia: para un detallado analisis de la sinonimia de la especie Sphyrna zygaena (Linnaeus, 1758), ver Antunes & Jonet, 1970 y Laurito, 1999.
However, there are species of shark, unique to coral reefs, which patrol the waters along the seaward face of reefs, frightening fish, swimmers and divers alike, though other species just visit the reefs (Carcharhinus leucas, Negaprion brevirostris, Gynglimostoma cirratum, Triaenodom obesus, Sphyrna zygaena, etc.
Castro (2011) reports a 45 cm juvenile nurse shark from the stomach of a 234 cm lemon shark, Negaprion brevirostris (Poey, 1868) and commented on the underwater observation of the simultaneous pursuit of an adult nurse shark by Sphyrna mokarran (Ruppell, 1837) and Carcharhinus leucas (Valenciennes, 1839), where both sharks failed to attack and the potential prey evaded.
One of the earliest works on fishes in North America is Smith's "Natural History of the Fishes of Massachusetts" (1833) which included eight species of sharks (and four rays), most of which can clearly be identified: Smooth Dogfish, Mustelus canis\ Spiny Dogfish, Squalus acanthi as', White Shark, Carcharodon carcharias; Blue Shark, Prionace glauca; Common Thresher, Alopias vulpinus; Hammerhead Shark, Sphyrna sp.
The scalloped hammerhead shark Sphyrna lewini (Griffith & Smith, 1834) is a semi-oceanic species globally distributed in coastal, warm temperate and tropical seas.
Among the primary species in observed landings were the scalloped hammerhead, Sphyrna lewini (15.