Thorp and Covich's Freshwater Invertebrates: Key to Fauna of the Australian Bioregion, Fourth Edition is developed to be the most modern and consistent set of taxonomic keys in the region. The design of the series provides a highly comprehensive, current set of keys for each of these bioregions, with all keys written in a consistent style. The book can be used to the full spectrum of interested readers, from students through to university professors and government agencies. This new volume provides an all-in-one reference for taxonomic classifications across this diverse bioregion and indispensable for biomonitoring and other studies of environmental health.