Any of several large predatory sharks of the genus Sphyrna,having the sides of the head elongated into large,fleshy extensions with the eyes at the ends.

• 槌头双髻鲨，属于双髻鲨属的大型食肉鲨鱼中的一种，它们的头部向前延伸得又大又肥胖，两只眼睛位于顶端。