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| Common names: shark (English), bonnethead (English), tiburón (Espanol), cornuda (Espanol) |
Sphyrna corona Springer, 1940
Scalloped bonnethead, Mallethead shark, Scalloped bonnethead shark
A hammerhead shark with moderately broad, but short, angular, mallet-shaped side extensions on head; width of hammer 24-29% of TL; anterior margin of head broadly arched with very shallow side and central indentations; snout long, length before mouth usually more than 40% of head width; mouth narrowly arched; front teeth blade-like, smooth, with 1 oblique point, deeply notched on rear side; rear teeth like front teeth; first dorsal fin moderately large and erect, its rear margin concave; second dorsal fin base about half length of anal fin base; origin of second dorsal fin above middle of anal fin; rear margin of anal fin nearly straight; transverse pit above tail base crescent shaped, a pit below tail base; tail fin strongly asymmetrical, notched under tip of top lobe, large lower lobe.
Grey on the back and side, white below; hammer, pectorals, pelvics and anal fin yellowish.
Size: reaches a maximum size of 92 cm; size at birth about 25 cm. This is the smallest species of hammerhead.
Habitat: a coastal species, demersal over soft bottoms.
Depth: 0-100 m?
The mouth of the Gulf of California to Peru, and Malpelo.