hypaxial

hypaxial Any structure morphologically ventral to the chordal axis;

轴前的任何的形态结构位于脊索轴部的；

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.

上尾鳍，轴前网的的上半部，从槽到接近端位的槽。