;internally, the major structural elements of the fin are an upturned urostyle that articulates with flattened bones that support the principial fin rays.
在内部，鳍
构素是支撑基本鳍条平坦硬骨，连接一个朝上尾杆骨。
;原始;internally, the major structural elements of the fin are an upturned urostyle that articulates with flattened bones that support the principial fin rays.
在内部，鳍构素是支撑基本鳍条平坦硬骨，连接一个朝上尾杆骨。
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