1. The document lists various phytoplankton species found in marine waters of Bangladesh, including diatoms, dinoflagellates, green algae, euglenoids, and yellow-green algae. 2. It provides the scientific names and classifications of 25 diatom species and 6 dinoflagellate species found in previous studies from 1975 and 2011. 3. The references cited at the end of the document are the sources for the species lists and previous studies conducted on marine phytoplankton populations in the Bay of Bengal and Sundarbans mangrove forests of Bangladesh.