Brissus unicolor
Brissus unicolor is a species of sea urchins of the family Brissidae. Their armour is covered with spines. Brissus unicolor was first scientifically described in 1778 by Nathanael Gottfried Leske.
Habitat
The urchin buries itself in the coarse sand at depths of 6 to 250 meters. In the Mediterranean Sea they can be sometimes found living buried in the sediment near the tapeweed, Posidonia oceanica.Description
When alive, the urchin's whole body is covered in brown spines. After the urchin dies, its shell has a distinctive pattern that consists of many grey spots. These spots are present on the urchin's test temporarily, disappearing after some time, leaving the urchin a white or a pale brown color.The urchin's test becomes thicker as the urchin matures. The test can reach a length of about 14 cm.