- Kingdom: Animalia
- Phylum: Chordata
- Subphylum: Tunicata
- Class: Ascidiacea
- Order: Stolidobranchia
- Family: Styelidae
- Scientific name: Botryllus leachii
- Norwegian: -
The animals (zooids) of this colonial sea squirt organize themselves in chains, unlike the star shaped structures of Botryllus schlosseri. There often two chains in parallel. Individual zooids are twice as long as wide and 1.5 - 3 mm long. The color varies, but brown, red, orange, yellow and grey variants are common.
This sea squirt encrusts stones and shells and can even be found on large algae. It occurs most frequently on depths from just below the tidal zone to 20-30 meters.
It is widespread in most oceans of the world and well known both in the Atlantic and Pacific Oceans.