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One new species, Diduga sphaeracephalus n. sp., is described from Thailand along with four newly recorded species, D. alternota Bucsek, 2014, D. bispinosa Bayarsaikhan & Bae, 2018, D. dubatolovi Bayarsaikhan & Bae, 2018 and D. allodubatolovi Bayarsaikhan, Li & Bae, 2020. Illustrations of adults and genitalia of examined species are provided.