;internally, the major structural elements of the fin are an upturned urostyle that articulates with flattened bones that support the principial fin rays.
在内,要结构要素是支撑基本条平坦硬骨,连接一个朝上尾杆骨。
;internally, the major structural elements of the fin are an upturned urostyle that articulates with flattened bones that support the principial fin rays.
在内,要结构要素是支撑基本条平坦硬骨,连接一个朝上尾杆骨。
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