EN
Diatoma from the surface sediments of the coastal area of Bandar Tawahi, a small embayment of the Gulf of Aden (Khormaksar), were studied by means of light (LM) and electron microscopes (SEM and TEM).Species analysis revealed the presence of numerous taxa, some of which are rare and little known such as: Mastoneis biformis, Navicula giffeniana and N. platyventris.In the case of each species, the ecological requirements (salinity preferences, life form) and geographical distribution are given.