This is the first comprehensive treatment of a major order of arachnids featuring more than 6,000 species worldwide, familiar in North America as daddy-longlegs but known scientifically as the Opiliones, or harvestmen. The 25 authors provide a much-needed synthesis of what is currently known about these relatives of spiders, focusing on basic conceptual issues in systematics and evolutionary ecology, making comparisons with other well-studied arachnid groups, such as spiders and scorpions. Broad in scope, the volume is aimed at raising relevant questions from a diversity of fields, indicating...