Nervous system and muscles in sea urchin larvae: Green indicates the entire larval nervous system. Magenta marks the muscles of the digestive tract. Tsukuba, Japan—A cluster of non-visual, ...
It used to be thought that sea urchins only had a primitive nervous system, but new research has found that they are far more complex than that. The entire body of a sea urchin is what researchers are ...
Consider the sea urchin. Specifically, the painted urchin: Lytechinus pictus, a prickly Ping-Pong ball from the eastern Pacific Ocean. The species is a smaller and shorter-spined cousin of the purple ...