The genus Henicotherus Brèthes 1928 and H. porteri Brèthes 1928 are redescribed and a neotype is designated. A new species is described and biological and distributional data are given for both species. On the other hand, a new species registered in expeditions carried out in Chañaral Island (Atacama Region) and Choros Island (Coquimbo Region), in the Los Choros archipelago is described. Biological and distribution data for both species and recommendations regarding the conservation of Henicotherus species are given.
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