The little urchin above lived up to its name by stabbing Oyster Fan underneath her thumbnail, leaving a shard of its spine lodged in her cuticle. Cute.
Technically, this urchin is a Stronglyocentrotus droebachiensis. But if that was too much gobbly-gook for you, just call it a green urchin.
Below: a close up photo of a sea urchin test (or shell), courtesy of Wikipedia. In live animals, spines attach to the raised bumps via a ball-and-socket joint, and gills and tube feet pass through the holes.
