hypaxial

hypaxial Any structure morphologically ventral to the chordal axis;

轴前任何形态结构于脊索轴；

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，轴前网后边缘上半，从后面凹槽到接凹槽。