hypaxial

hypaxial Any structure morphologically ventral to the chordal axis;

轴何形态结构位于脊索轴部；

upper postventral margin In the caudal fin, the upper part of the postventral margin of the hypaxial web, from the posterior notch to the subterminal notch.

上后边缘在尾鳍，轴网后边缘上半部，从后面凹槽到接近端位凹槽。