Freshwater stingray | 台北市立動物園資訊網
These flattened fishes have eyes on the top of their bodies with mouths and gill slits on their undersides. Directly behind the eyes are spiracles, which are openings that allow for respiration. Their tails are typically longer than their disc width and usually have one or more long, saw-like spines behind the pelvic fin. Used for self-defense, the stinger is tipped with barbs that can rip through flesh when withdrawn. Each spine has grooves underneath that contain protein-based venom. The spines are constantly being shed and replaced, allowing the stingray to sometimes have two stingers as a new stinger grows in to replace the older one. Most South American species have colorful dorsal patterns that feature spots of different sizes and background colorings of gray, brown or black.
Freshwater stingray | 台北市立動物園資訊網
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Potamotrygon motoro (Motoro Stingray, P01 | 台北市立動物園資訊網
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Giant freshwater stingray | 台北市立動物園資訊網
【珍珠魟】:江魟科;
身體呈圓盤狀,背部色彩由褐色至淡褐色,上有圓形奶油狀的斑點散布,尾柄的棘刺為中空的構造,有分泌毒液的毒腺及儲藏毒液的...