The book "The systematic position of the South American frog, Allophryne ruthveni Gaige" by Lynch, John D. and Freeman, Howard L., is the result of an in-depth study of the species Allophryne ruthveni, which is an interesting representative of the amphibians of South America. The book deals with systematic aspects, classification, ecology and life features of this species of frog. The authors testify to the importance of research and preservation of biodiversity of little-studied amphibian species, which is becoming a key task in nature conservation in the modern world. This book will provide readers with an in-depth look at the unique species Allophryne ruthveni and its place in the natural world.