The short-spined, motile toxopneustids (e.g., Lytechinus variegatus) have a delicate test, which limits them to areas with low wave impact.
The short-spined, motile toxopneustids (e.g., Lytechinus variegatus) have a delicate test, which limits them to areas with low wave impact.
肛门在身体的上方，有些品种会有一个半透明球状的排泄殖腔。