stingray


stingray
/sting"ray'/, n.
any of the rays, esp. of the family Dasyatidae, having a long, flexible tail armed near the base with a strong, serrated bony spine with which they can inflict painful wounds.
[1605-15; STING + RAY2]

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Any of various species (family Dasyatidae) of rays noted for their slender, whiplike tail with barbed, usually venomous spines.

Most species inhabit warm seas; a few live in the rivers of South America. Species range in width from 10 in. (25 cm) to 7 ft (2 m). Stingrays eat worms, mollusks, and other invertebrates. These bottom-dwellers often lie partially buried in the shallows, lashing their tail when disturbed. Large stingrays can drive their tail spines into a wooden boat. The spines cause serious, extremely painful wounds that, if abdominal, may be fatal.

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fish
 any of a number of flat-bodied rays noted for the long, sharp spines on their tails. They are sometimes placed in a single family, Dasyatidae, but often separated into two families, Dasyatidae and Urolophidae. Stingrays are disk-shaped and have flexible, tapering tails armed, in most species, with one or more saw-edged, venomous spines.

      The dasyatid stingrays, also called whip-tailed rays (whip-tailed ray) and stingarees, inhabit all oceans and certain South American rivers. They have slim, often very long, whiplike tails. They vary in size: Dasyatis sabina, a small western North Atlantic species, is mature at a width of about 25 cm (10 inches), but the Australian D. brevicaudata reportedly attains a width of about 2 m (7 feet) and a length of 4 m. The urolophid, or round stingrays, are considerably smaller, the largest attaining a length of about 75 cm. Round stingrays have relatively short tails and well-developed tail fins. They are found in the Pacific and western Atlantic.

      Stingrays inhabit warm temperate and tropical waters, sometimes in great abundance. They are bottom dwellers and often lie partially buried in the shallows. Stingrays eat worms, mollusks, and other invertebrates, sometimes badly damaging valuable shellfish beds. They lash their tails when stepped on, and large stingrays can exert enough force to drive their tail spines into a wooden boat. The spines cause serious, extremely painful wounds that, if abdominal, may result in death.

      Certain other rays may also possess tail spines. Some of the manta rays and eagle rays (eagle ray) are so armed. The latter, forming the family Myliobatidae, comprise several genera found in warm and temperate coastal waters. They have very long, slim tails and, unlike other rays, have heads that project beyond the body disk. Notable members of this family include the spotted duckbilled ray (Aetobatus narinari), a large Atlantic and Pacific species that can cause deep wounds with its tail spines, and the bat stingray (Myliobatis californicus), a Pacific form noted for its depredations on the shellfish of San Francisco Bay.

      Two other families, the butterfly rays (butterfly ray) (Gymnuridae) and cow-nosed rays (Rhinopteridae), are found in shallow coastal waters of tropical and warm temperate seas and reach widths of about 2 m.

      The possible existence of another stingray family, consisting of deepwater species, was indicated in 1981 with the identification of Hexatrygon bickelli. The specimen, found on the coast of South Africa, showed unique adaptations to deepwater life and was classified by its discoverers in a separate family and suborder.

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Universalium. 2010.

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