hypural

hypural notch The crease formed when the caudal fin is bent or flexed.

尾下骨凹槽当尾鳍被弯曲弯曲的，成的摺痕。

hypural bones The fan-shaped series of bones (sometimes fused to one or two plate-like bones) to which the caudal fin rays are attached.

尾下骨尾鳍鳍条附的扇成列硬骨(有融合成个板状硬骨)。