Sphyrnidae (hammerhead shark; subclass Elasmobranchii, order Lamniformes) A small family of marine, occasionally brackish-water sharks characterized by the sideways expansion of the head with the eyes and nostrils located almost at the tip of the lateral expansions. These peculiar sharks are found principally in tropical coastal regions and tend to be large (e.g. Sphyrna zygaena grows to 7 m). There are about nine species.
hammerhead shark See SPHYRNIDAE.
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