Seven taxa including three new species of Mallacoota are reported from the South Pacific locations of Papua New Guinea, New Caledonia and the Kermadec Islands. Mallacoota mizegwaden sp. nov. was collected from Papua New Guinea, and M. lifou sp. nov. and M. xepenehe sp. nov. from New Caledonia including the Loyalty Islands. Additional material of M. nananui Myers, 1985 is identified from New Caledonia, supporting previous records by Ledoyer, 1984. Three species, Mallacoota capricornia Lowry & Hughes, 2009; M. chiltoni Kilgallen & Ahyong, 2011 and M. sirius Hughes, 2011 are reported from the Kermadec Islands. There are now 33 known species of Mallacoota, with 19 species occurring in tropical to subtropical waters.

Within an amphipod collection from Bora Bora (Polynesia) several species of Elasmopus were found: E. alalo Myers, 1986, E. hawaiensis Schellenberg, 1938, E. hooheno Barnard, 1970 and E. polynesus sp. nov. Among them was also a second member of Carangoliopsidae, known until now only by one genus with one single species: here is presented another species in a new genus, Kairos segregans gen. nov., sp. nov.