- Kingdom: Animalia
- Phylum: Chordata
- Subphylum: Tunicata
- Class: Ascidiacea
- Order: Aplousobranchia
- Family: Didemnidae
- Scientific name: Lissoclinum perforatum
- Norwegian: -
The colonies are usually 2 mm thick and rarely more than 3 cm across. The color is white or creamy. The regularly scattered inhalant pores are smaller than the fewer exhalent pores. The inhalant pores are larger than those of the Didemnum species.
This sea squirt seems to prefer hard substrate on exposed locations.
This colonial sea squirt is well known from the south and west coasts of the British Isles. The distribution along the Norwegian coast is somewhat uncertain. It can probably be found along the entire west coast of Norway, and at least as far north as Trøndelag. It is widespread in the Atlantic Ocean, including the southern hemisphere.