urostyle

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

肛门肌分节肛门边缘肌分节部分；包括将形成杆骨末端肌分节。

;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，主要结构要素是支撑基本条平坦硬骨，连接一个朝杆骨。