Mitra Arman - Faculty of Biosciences, Shahid Beheshti University,Tehran, Iran.
Hossein Riahi - Faculty of Biosciences, Shahid Beheshti University,Tehran, Iran.
Morteza Yosefzadi - Faculty of Basic Science, Hormozgan University, Bandar Abbas, Iran.
Ali Sonboli - Faculty of Medicinal Plants and Drugs, Shahid Beheshti University, Tehran, Iran.

Cyanophyta are the photosynthetic prokaryotes found in most of the ecological habitats. They are very diverse group in concept of morphology and physiology and have been an interesting group for investigation. In the present investigation thermophilic cyanophyta have been identified from three hot springs including Fariyab, Todlooye and Fotooye located in west of Hormozgan province. Sampling was based on temperature gradients. Water physicochemical characteristics analyzed because of their dramatic effects on species distribution. The collected samples from different collection sites and various temperature ranges were fixed in ۴% formaldehyde to minimize quantitative and qualitative changes. Taxonomic determination was carried out using artificial keys presented in some valid publications. As a result of this study, a total of ۶۶ species were identified including ۵۶ species, ۲۲ genera and ۱۰ families from Fariyab hot spring; ۲۹ species, ۱۱ genera and ۶ families from Fotooye hot spring and ۱۲ species, ۶ genera and ۲ families from Todlooye hot spring.

CYANOPHYTA, hot springs, thermophilic, Hormozgan province, Iran