Tethea longisigna is a moth in the family Drepanidae first described by Gyula M. László, Gábor Ronkay, László Aladár Ronkay and Thomas Joseph Witt in 2007.

[1][failed verification] It is found in the Chinese provinces of Heilongjiang, Shaanxi, Gansu, Xinjiang, Hubei, Zhejiang, Fujian, Sichuan and Yunnan.

[2]

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