Because of their abundance and diversity, invertebrates play an essential role in the functioning of natural and human engineered environments, where they may be important indicators of environmental quality. This book is a guide to invertebrate orders known to occur on land in Australia. A series of illustrated keys allows the reader to identify invertebrates to the order level. The text is supplemented by detailed line drawings of one representative species from each of the 68 orders. Pocket-sized for easy field use this book will prove invaluable to teachers, students, and naturalists, as well as professional ecologists.