Also known as Colonial Ascidians, Compound Ascidians, Golden Sea Squirt, Robust Sea Squirt, Robust Tunicate, Sea Squirts, Soft Sea Squirt, Tunicates, Urn Sea Squirt and Urn Ascidian.
Found in groups anchored to hard surfaces in shallow sheltered water growing on dead corals.
They feed on detritus and plankton.
Depth - 1-20m
Widespread Indo-West Pacific
These urn shaped ascidians have numerous oral siphons.
Often confused with Didemnum molle which has numerous and minute oral siphons.
They vary in colour from white, orange to bright green.
The green colour inside is the result of being inhabited by minute blue/green algae.
The Egyptian sea star - Gomophia egyptiaca and the Sea Snail - Gyrineum gyrinum prey upon this sea squirt.
(edit) Ref: https://en.wikipedia.org/wiki/Atriolum_robustum