This volume looks at the Rotifer genus Lecane, the only genus in the family Lecanidae. The Lecanidae are a group of common fresh and saline water, substratum dwelling Rotifera. They are found mainly in littoral habitats. This volume provides a comprehensive key to the 163 species of Lecane which are treated as valid. Notes on taxonomy, nomenclature, diagnosis and morphology are included. Individual species accounts follow the key, providing a description, the type locality, and notes on differential diagnosis and distribution. The book concludes with a checklist of names and synonyms in Lecane.