The types of all species belonging to the genus Goniadera Perty, 1830 are studied. The lectotype of Melandrya repanda Fabricius, 1801, is designated. Eight new species of Goniadera are described: Goniadera ardoini sp. nov., Brasil, G. barclayi sp. nov., Brasil and Peru, G. girardi sp. nov., G. jaegeri sp. nov., G, merkli sp. nov., Brasil, G. onorei sp. nov. from Ecuador, G. peseudorepanda sp. nov. from Costa Rica and Mexico and G. ñoresi sp. nov. from Argentina. Goniadera simplex Fairmaire, 1889 is transferred to Aemyone Bates, 1868, but this genus is degraded to sub-genus of Goniadera. The name Goniadera (Aemyone) simplex (Fairmaire, 1889) comb, nov., is proposed. The genus Opatresthes Gebien, 1928 is studied and considered as another subgenus of Goniadera. Goniadera tuberculifera Fairmaire, 1889 is trasferred to this genus, the new name Goniadera (Opatresthes) tuberculifera (Fairmaire, 1889) comb, nov., is proposed. A new species from Nicaragua: Goniadera (Opatresthes) maesi sp. nov. is described. A key to separate all sub-genera and species is provided. Etaceta aeneicolor Fairmaire, by monotypy is excluded from the tribu Goniaderini and its position in the tribu Lupropini sensu Ardoin (1969) is confirmed. New synonymies are recognised: Goniadera simplex Fairmaire (= Aemyone bordoni Marcuzzi, 1994) syn. nov., Aemyone cariosa Fairmaire, 1873 (= Anaedus striatipennis Pic, 1917) syn. nov. and (Aemyone silvanae Marcuzzi, 1994) syn. nov.; Aemyone crenata Champion, 1886 becoming homonymie with Goniadera crenata Perty, 1830 is changed in Goniadera (Aemyone) championi nom. nov.
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