Sphyrna mokarran (Rüppell, 1837) .

Great Hammerhead. To 6.1 m (20 ft) TL (Weigmann 2016). Circumglobal; western Pacific Ocean north to Kyushu, Japan (Yoshino and Aonuma in Nakabo 2002); Bahía Magdalena, southern Baja California (Galván-Magaña et al. 2000) to northern Peru (Chirichigno and Vélez 1998), including Islas Galápagos (Grove and Lavenberg 1997). Gulf of California population perhaps extirpated (Pérez-Jiménez 2014). Depth: surface to at least 300 m (984 ft) (min.: Yoshino and Aonuma in Nakabo 2002; max.: Myers 1999). Sphyrna mokarran may be composed of two species; one from the Atlantic and one from the Indo-Pacific (Naylor et al. 2012).