Preface -- Chapter 1: Evolution of Bilateria from a Meiofauna Perspective - Miniaturization in the Focus -- Chapter 2: Meiofauna Shaping Biogeochemical Processes -- Chapter 3: Meiofauna and Biofilms - the Slimy Universe -- Chapter 4: Meiofauna Meets Microbes: Chemosynthetic Symbioses -- Chapter 5: Marine Meiofauna Diversity and Biogeography - Paradigms and challenges -- Chapter 6: Freshwater Meiofauna - a Biota with Different Rules? -- Chapter 7: Hidden Players - Meiofauna Mediates Ecosystem Effects of Anthropogenic Disturbances in the Ocean -- Chapter 8: Deep-Sea Meiofauna - a World of its Own or Deeply Connected? -- Chapter 9: Polar Meiofauna - Antipoles or Parallels? -- Chapter 10: Cave Meiofauna - Models for Ecology and Evolution -- Chapter 11: Meiofauna - Adapted to Life at the Limits -- Concluding Remarks -- Index.