Map of species richness in land planarians on an equal area grid map; maximum in red, minimum in dark blue (from Sluys 1998). Over the past 20 years new discoveries have added to the number of native and introduced species. Nevertheless, the current pattern of biodiversity remains very similar to the one shown in this map, although now, for example, about 20 new species are recognized in Europe, 40 in southeastern and southern Brazil and northeastern Argentina, nine in the Australian territories, and six in New Zealand (Sluys 2016).