Symmoca crocodesma is a moth in the Autostichidae family. It was described by Meyrick in 1911. It is found in South Africa. The wingspan is about 10 mm. The forewings are light purplish-grey densely irrorated with black. There is a moderate deep ochreous-yellow rather irregular-edged medial transverse fascia and an irregular ochreous-yellow spot on the tornus and a slightly larger one on the costa opposite, almost meeting. The hindwings are grey.