👉 Nannocysts are small, aquatic invertebrates that primarily inhabit freshwater habitats such as lakes, rivers, and streams. They are characterized by their highly specialized structures, which include a single cell with multiple cells attached to it, known as a nannocyst. These structures allow them to efficiently capture nutrients from the water and store them for later use in their metabolism. Nannocysts play a crucial role in freshwater ecosystems by serving as primary producers, providing essential nutrients through photosynthesis.