Parioglossus marginalis

brackish waters of the coast of New South Wales, Australia^[2] and around the northern part of the North Island and Great Barrier Island in New Zealand,^[3] This species may be an introduced species in New Zealand, being brought from Australia in ship's ballast water.^[4] This species can reach a length of 3.3 centimetres (1.3 in) SL.^[5] It is thought by some workers that Parioglossus neoclaedonicus from New Caledonia may be a synonym of P. marginalis and that the Caroline Islands species Parioglossus verticalis , which is known form just a single specimen, may also be synonymous with this species. To resolve these taxonomic uncertainties molecular studies will be required.^[1]