Plakobranchus noctisstellatus is a small Sacoglossan that we spotted in 2014 when diving on the sand at a local Koh Phangan dive site. It had a busy nature and long rolled rhinophores, which look quite like oral tentacles when you have shaky eyesight!!
So we initially thought that it was a species of Cerberilla until we saw the photos back at the diving centre. Reference guides suggested that it belonged to the Plakobranchus ocellatus species complex.
However we did not believe this, because of its behaviour and a few elements of its appearance. And, happily to say, in 2020 Plakobranchus noctisstellatus was named as a new species – from the Gulf of Thailand!