urostyle

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

肛门后的肌肛门的后面的边缘肌；包括将形成尾杆的末端肌。

;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，的主要结构要素是支撑基本条的平坦硬，一个朝上的尾杆。