Mixed media, oil, acrylic. The Mediterranean sea, view from underwater. Two sea urchins, all is calm, everything takes it's time... Patience and contemplation as a life long learning curve. Paracentrotus lividus is a species of sea urchin in the family Parechinidae commonly known as the purple sea urchin. It is the type species of the genus and occurs in the Mediterranean Sea and eastern Atlantic Ocean. The sea urchin Paracentrotus lividus, an eatable species of great commercial interest found in the Mediterranean and North-East Atlantic, is more vulnerable than it was believed so far.