The arcturid genera Chaetarcturus Brandt, 1990 and Dolichiscus Richardson, 1913 are rediagnosed and six deep-water species recorded or described: C. abyssicola (Beddard, 1886) from north-eastern Australia; C. crosnieri n.sp. from the Coral Sea and New Caledonia, C. taniae n.sp. from New Caledonia, D. cornutus (Beddard, 1886) from Philippines, Indonesia and New Caledonia; and D. kai n.sp. and D.tanimbar n.sp. from Indonesia.
Crustacea, Isopoda, Valvifera, Arcturidae, Chaetarcturus, Dolichiscus, south-western Pacific Ocean, systematics, new species.