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Potamotrygon brachyura


Potamotrygon brachyura
Giant Short Tail Stingray
巨型龟甲魟
The Short-tailed river stingray (Potamotrygon brachyura) is a species of river stingray (Potamotrygonidae) native to South America; they are known to inhabit Paraguay, Uruguay and Argentina basins. 
Short-tailed river stingrays are circular in shape and humped in the back. The biggest recorded specimen was a 661 pounds (300 kilograms) ray, which makes them the largest of the Potamotrygon species. They have a dark pattern on their backs, probably used as camouflage. The ray's tail is very muscular and thick, covered with short spines at the base and a venomous sting at the end.
They are mainly distributed throughout the Paraná-Paraguay River (including Cuiabá river in Brazil), Uruguay basins and Argentina.
Female stingrays give birth to up to 19 fully formed young stingrays at one time. The pups will start off eating plankton and then move on to consume small mollusks, crustaceans, the larvae of aquatic insects and fish.
特征:背部呈现出蜂窝状的纹路,是淡水魟鱼之中最大型的品种,通常都在1公尺以上,最大者可超过1.5公尺。
其全身呈灰褐色,并布满暗褐色的大龟甲形状,尾部短而胖,只要喂食虾?小鱼即可,因此饲养并不困难。而他们很容易经由以下共同性的特征而辨别出来:比较小的眼睛﹔尾长明显的比体盘的直径还短。
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