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Macrouridae (Macruridae; grenadier, whiptail; subclass Actinopterygii, order Gadiformes) A large family of marine mid-water fish that have very long dorsal and anal fins tapering down to the pointed tip of the tail, the tail fin being absent. The blunt head has large eyes and often shows a chin barbel. The small pelvic fins are usually located under or in front of the pectorals; all fins are spineless. Most grenadiers live near the sea-bottom at depths of 200–1200 m. There are about 250 species, distributed world-wide.