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Dive Into the Oceans

What it's About

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The stingrays are a family—Dasyatidae—of rays, cartilaginous fishes related to sharks. They are common in coastal tropical and subtropical marine waters throughout the world, but the family also includes species found in warmer temperate oceans such as Dasyatis thetidis, and species entirely restricted to fresh water such as D. laosensis and Himantura chaophraya. With the exception of Pteroplatytrygon violacea, all dasyatids are demersal.[2]

They are named after the barbed stinger (actually a modified dermal denticle) on their tail, which is used exclusively in self-defense. The stinger may reach a length of approximately 35 cm, and its underside has two grooves with venom glands.[3] The stinger is covered with a thin layer of skin, the integumentary sheath, in which the venom is concentrated.[4] Some species have several stingers, and a few, notably Urogymnus asperrimus, lack a sting entirely.[5]

Other types of rays also referred to as stingrays are the river stingrays (family Potamotrygonidae), the round stingrays (families Urolophidae and Urotrygonidae), the sixgill stingray (family Hexatrygonidae), and the deepwater stingray (family Plesiobatidae). For clarity, the members of the family Dasyatidae are sometimes called whip-tail stingrays.[6]

A fish is any aquatic vertebrate animal that is covered with scales, and equipped with two sets of paired fins and several unpaired fins. Most fish are ectothermic (or cold-blooded). Fish are abundant in most bodies of water. Fish can be found in high mountain streams (e.g., char and gudgeon) and in the deepest ocean depths (e.g., gulpers and anglerfish). According to FishBase, 31,500 species of fishes had been described by January 2010.[1]

dolor sit amet, consectetur adipiscing elit. Nunc interdum nunc ut nunc tincidunt vitae imperdiet lacus venenatis. Nunc lectus augue, laoreet eget convallis sit amet, molestie eu sem. Nullam vestibulum facilisis justo nec aliquam. In erat turpis, mattis eu placerat et, porta sit amet lectus. Sed imperdiet odio in ante eleifend a vestibulum urna posuere.