Abstract
Descriptions of 6 new species of marine or estuarine tubificid oligochaetes are given. T. kozloffi and T. brevicoleus are described from intertidal habitats of Washington [USA] and British Columbia [Canada]. T. foliatus, a species previously identified as belonging to the T. gabriellae complex, is described from California and British Columbia. T. cuspisetosus, T. palacoleus and T. crenacoleus are described from the Arctic. A key to the species-groups of Tubificoides is given.