Thyrosticta bruneata is a moth of the subfamily Arctiinae first described by Paul Griveaud in 1969. It is native to Madagascar.
The male of this species has a wingspan of 18 mm, while the female has a wingspan of 22 mm. The forewings are dark brown, with one ochreous-yellow post basal spot, another whitish spot and two small whitish antemarginal spots. The hindwings are uniformly ochreous yellow and lack an external border.Griveaud, P. (1969). "Amatidae nouveaux ou peu connus de Madagascar (Lep.)". Bulletin de Madagascar. 274: 3–20.
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