The entire body of a sea urchin is what researchers are now calling an “all-body brain,” with neurons that function as a ...

The pointy shell of sea urchins hides a remarkably complex neural network that resembles the brains of vertebrates, new research suggests.

Beneath sea urchins’ exterior spines, rounded skeletons called tests are jewels of color, texture, and symmetry. There are hundreds of urchin species, and they’re found in every ocean on Earth, from ...

Biologists thought that marine heat waves lowered urchin reproduction only at lethal temperatures. A new study shows ...