The larvae of sea urchin start swimming backwards on exposure to strong light — a finding that fills in a missing piece in how light-responsive systems developed in animals. Almost all living ...

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, ...

Long-spined sea urchins have emerged as an environmental issue off Australia’s far south coast. Native to temperate waters around New South Wales, the urchins have expanded their range south as oceans ...

Ravenous, brainless and covered with spikes, sea urchins have evolved to not be messed with. Off of the south coast of Oregon, one kind of urchin in particular, the purple sea urchin, is enjoying an ...