A recent study of the large-scale biogeography of benthic deep-sea copepods discovered that species of Paramesochridae were found in South Atlantic abyssal plains and in the deep Southern Ocean. Nineteen morphospecies from four genera (Emertonia Wilson, 1932, Leptopsyllus T. Scott, 1894, Paramesochra T. Scott, 1892, Wellsopsyllus Kunz, 1981) were distinguished. For example, Emertonia andeep (Veit-Köhler, 2004) and E.