This book is an essential volume for the library of scorpion biologists (present and future), as well those interested in arachnids and arthropods in general...a very well-written and well-conceived book. -- Journal of Zoological Systematics and Evolutionary Research This book is an essential volume for the library of scorpion biologists (present and future), as well those interested in arachnids and arthropods in general...a very well-written and well-conceived book. -- Journal of Zoological Systematics and Evolutionary Research