Deltoplastis cognata is a moth in the family Lecithoceridae. It was described by Chun-Sheng Wu and Kyu-Tek Park in 1998. It is found in Sri Lanka.
The wingspan is .Wu, C. S. & Park, K. T. (1998). "Taxonomic review of the family Lecithoceridae (Lepidoptera) from Sri Lanka II. The subfamily Torodorinae: Genera Deltoplastis Meyrick, Hygroplasta Meyrick, and Antiochtha Walker". Insecta Koreana. 15 : 1-22.
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