Eristena medexpansa is a species of moth in the family Crambidae. It was described by Ping You, Hou-Hun Li and Shu-Xia Wang in 2003. It is found in Guangxi, China., 2006: A review of the genus Eristena Warren in China (Lepidoptera: Crambidae: Acentropinae). Aquatic Insects 28 (3): 229-241.
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