About Phallusia mammillata (Cuvier, 1815)
Phallusia mammillata is a solitary ascidian species that can reach a height of approximately 20 cm (8 in). Its tunic is translucent, bluish-white, and covered with irregular rounded lobes or mounds. This tunicate occurs on rocky, sandy, or muddy substrates in the northeastern Atlantic Ocean, the North Sea, the English Channel, and the Mediterranean Sea, at depths down to around 200 m (656 ft).