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This species is a simple, solitary ascidian, that sometimes grows in dense clusters. The body is globular in shape, measures 1-4 cm in diameter, and attaches to the substrate at its base. The oral and atrial siphons are positioned anteriorly, and prominent when extended. Overall, the tunic is translucent to greyish-green in colour; the surface is covered with numerous tiny hair-like fibrils, often fouled with pieces of shell, algae, or sediment. A bean-shaped kidney is located on the right side of the body, and along with the reproductive gonads, is often visible through the tunic.


Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© Frey, Melissa

Source: Marine Invaders of the NE Pacific

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