Genus Trichodesmium is a type of cyanobacteria that is dominant in nutrient-depleted tropical and subtropical oceans where it plays a significant role in biogeochemical cycles including nitrogen fixation. This genus is also known by various other synonyms, including 'Trichodesmium Thiebaut', 'Ophidiella Sykes', 'Hemisphaerium Gomont', and 'Eutrichodesmium Talling', among others. These synonyms reflect differences in the classification and morphological characteristics of these microorganisms. Despite these differences, all of these organisms play a critical role in their ecological niches, promoting nutrient cycling and maintaining biodiversity in marine environments. Studying these microorganisms is crucial for understanding the functioning of marine ecosystems and their potential to respond to global change and environmental stressors.