Description
This sea squirt is probably spread by ballast water and is now far found around the world.
The first observation of this ascidian from the Oosterschelde, was done in 1977. It is now massively found in the waters of Zeeland.
With a thin gelatinous membrane to cover various hard substrates. The colonies have combined exhalent openings which are generally quite large.

Size
The colonies can be tens of square centimeters in size and are usually a few millimeters thick.

Colour
Variable from almost transparent to dark grey.

Habitat
Shallow waters, attached to hard substrate.

Distribution
This species has a global distribution.