El tiburón vaca de ojos grandes (Hexanchus nakamurai) es una especie de pez marino que se encuentra en el océano Atlántico, Florida, alrededor de Cuba y las Bahamas, y océano Índico este de África y Madagascar, las Filipinas, y Taiwán, a una profundidad de 90 a 600 m.

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The bigeyed sixgill shark, Hexanchus nakamurai, is a cow shark of the family Hexanchidae. Its dorsal surface has a brownish-gray color, and is sharply separated from the light coloring of its ventral surface. The eyes are a fluorescent green while the shark is alive. The body of this shark is small, slim, and fusiform in shape. As the name suggests, this shark has six gill slits, unusual among most shark species. The head is narrow and somewhat flattened, and the mouth contains 5 rows of large, comb-shaped teeth. This shark's single dorsal fin is pushed back towards the caudal fin, and is behind the pelvic fins. The upper caudal fin is much longer than the lower, with a deep notch near the tip. All fins have thin white margins on the edge. In juveniles, the upper caudal fin has a black tip.

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