Fidia (formerly known as Lypesthes) is a genus of leaf beetles in the subfamily Eumolpinae.

[5][6] In 1861, Victor Motschulsky described a new species of beetle from Japan with the name Fidia atra.

In 1863, Joseph Sugar Baly designated Fidia atra as the type species of a newly established genus with the name Lypesthes.

[7] An application to suppress Fidia Motschulsky, 1861 (with the year incorrectly given as "1860") and conserve usage of Fidia Baly, 1863 and Lypesthes Baly, 1863 was submitted to the ICZN in 2006.

This proposal was rejected by the commission in 2009, upholding the priority of Fidia Motschulsky, 1861.