Sea urchins are simple creatures, wandering the seafloor without thought. Or so we thought. They are members of the phylum Echinodermata, which first appeared during the Cambrian explosion. Their list ...

Sea urchins graze on and clean a type of algae that competes with coral, and their decimation is a big reason for the decline of the coral reef ecosystem in the Caribbean. Sea urchins play an ...

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

This fundamentally changes how we think about the evolution of complex nervous systems,” said biologist Jack Ullrich-Lüter.