Demotispa filicornis is a species of beetle of the family Chrysomelidae. It is found in Ecuador.
Description Adults reach a length of about 5.6 mm. The pronotal disc and elytral disc are red, while the head, explanate margins of the pronotum and elytra, and the legs are yellow.
Life history No host plant has been documented for this species.
Etymology The species is named after its very slim antennae.
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