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The problematic genus Aaptos Gray (Hadromerida: Suberitidae) is evaluated in the light of new and re-defined taxonomic characters. Aaptos aaptos (Schmidt) is re-described from type material and a framework is constructed for the recognition of new species. Trachya pernucleata Carter is also re-examined and relegated in synonymy with Aaptos. Four new species from northern New Zealand are described.