hypural notch The crease formed when the caudal fin is bent or flexed. 尾下骨凹槽当尾鳍被弯曲或弯曲的时候,形成的摺痕。
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. 尾下骨尾鳍鳍条附著的扇形成列硬骨(有时融合成一或二个板状硬骨)。