Oreodera antonkozlovi, new species from Ecuador is described and illustrated. A key to species of Oreodera, currently known from Ecuador, is provided. Moreover, the following new country records are reported in Oreodera: O. basicretata (Brazil); O. cretata (Peru); O. sororcula (Brazil); O. wappesi (Costa Rica and Guatemala). Additionally, new state records from Brazil are added: O. bituberculata (Goiás); O. griseozonata (Amapá); O. melzeri (Amazonas).
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