Echinoderms exhibit a remarkable capacity for regeneration, a faculty underpinned by a complex interplay of cellular processes and molecular signals. Their ability to rebuild entire organs or limbs ...

As mist lingers over a Swedish fjord lined with towering, forested cliffs, a group of scientists collect mud from the bottom of the turquoise-colored waters. They’re after brittle stars—marine animals ...

To the untrained eye, the ancient brittle star fossil above looks like what you’d expect of a now-especially-brittle echinoderm. But the fossil is quite rare: It captures the moment at which the ...