urostyle

postanal myomeres Myomeres posterior to the posterior margin of the anus; includes terminal myomere from which urostyle will form.

肛门后的节肛门的后面的边节部；包括将形成尾杆骨的末端节。

;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，的主要结构要素是支撑基本条的平坦硬骨，连朝上的尾杆骨。