Downesia kwangtunga is a species of beetle of the family Chrysomelidae. It is found in China (Guangdong).
Description Adults reach a length of about 3.5–5.5 mm. They have a shortened row of several punctures on the apical one-fifth of the elytra.Cassidinae (Coleoptera: Chrysomelidae) types deposited at Sun Yat-sen University, Guangzhou, China
Life history No host plant has been documented for this species.
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