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Abstract
Eighteen species of valviferan marine isopods (Chaetiliidae, Pseudidotheidae, Arcturidae) from six Brazilian expeditions to Antarctica are reported. Three new species of Arcturidae are described: Dolichiscus ferrazi, Dolichiscus brandtae and Antarcturus nonatoi. Drawings and description of pleopods 1 and 2 from Dolichiscus meridionalis (Hodgson, 1910), Antarcturus horridus serratus Brandt, 1990 and Chaetarcturus longispinosus Brandt, 1990 are presented, as well as new records of described species.