|Similar Phyllidia, Phyllidia elegans, Phyllidia exquisita, Phyllidiella rosans, Phyllidiella zeylanica|
Phyllidia alyta is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Phyllidiidae.
This species was described from Ari Atoll, Maldives. It has been found in the Indian Ocean from the Maldives, Mauritius, Réunion, Sri Lanka and Myanmar.
This nudibranch has a grey coloured dorsum with white tubercles in rows separated by four longitudinal black stripes. The rhinophores are yellow and some of the dorsal tubercles are tipped with yellow.
This species feeds on a sponge.