the revival of the Indo-Australian genus Guastica as a valid genus was made in G.Leraut 2021 (p58).
https://www.conchbooks.de/?t=53&u=55402&bookgroup=&subgroup=&group=insects#

This genus was previously placed as a synonym of the Neotropical genus Piesmopoda, which I discussed with Franziska Bauer a few years ago - we both concluded the two genera were not related by comparing illustrations of genitalia in publications of the phycitines from Sumatra and Belize. G. Leraut also agrees with this opinion.