Phyllidia alyta is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Phyllidiidae.

[2] 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.

[3] This nudibranch has a grey coloured dorsum with white tubercles in rows separated by four longitudinal black stripes.

[3] This species feeds on sponges.