Idaea lycaugidia is a moth of the family Geometridae first described by Louis Beethoven Prout in 1932. It is found in northern Madagascar.
This species has a wingspan of 14–18 mm and looks similar to Idaea lilliputaria (Warren, 1902) in shape and general aspect.Prout, L. B. (1932). "New genera and species of Sterrhinae (Fam. Geometridae)". Novitates Zoologicae. 37: 229–251 on page 250.
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