hypaxial

hypaxial Any structure morphologically ventral to the chordal axis;

轴前任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.

上在尾鳍，轴前上半部，从面凹槽到接近端位凹槽。