Diatoms are a large and diverse group of single-celled algae. Diatom-based indices are increasingly becoming important tools for assessment of environmental conditions in aquatic systems. Diatoms have long been lauded for their use as powerful and reliable environmental indicators. Diatoms are widely used as assessment tools in the understating / interpretation and management of environments. This guide has been compiled for those who wish to beginner of a study of the diatom taxa of India. It is hoped that this guide may also serve as a valuable aid-memoir for those diatomists involved in...