This yellow Berthellina is very similar to Berthellina delicata. We used to think the yellow and orange species were color forms of the samespecies. However, we noticed that when either form paired up or formed groups, they always did so with those that were colored the same. Apparently, as noted on the Sea Slugs of Hawaii page, there is now DNA evidence that the two color forms are in fact different species. This makes sense, since I'm sure that when pairing up, these animals are more capable of recognizing their own kind than we are.
Created 22 June 2020