The small fan-footed wave (Idaea biselata) is a moth of the family Geometridae.

Outside of Europe it is found in the Caucasus, Transcaucasia, in the north of Turkey, in Siberia, in northern Kazakhstan, as well as in the Russian Far East.

The subspecies Idaea biselata extincta (Staudinger, 1897) is represented in Korea and the Ussuri region.

The larva is long and thin, with a few short setae, brownish grey with a white side stripe.

[1] The larva feeds on a variety of plants including asparagus, dandelion, knotgrass, oak, plantain and Rubus.