These small tunicates are common on many atoll reefs. We have seen these figured as Didenmum molle, but Gosliner et al (1996) notes that the similar Atriolium robustum has larger and fewer oral siphons as seems to be seen in our photos.
Those below are sharing the space with some of what we are calling Didemnum sp. 6.
Created 31 March 2019
Updated 29 September 2023