Description of some rugose corals from the Givetian and Lower Frasnian of the Eastern Alborz Mountains, NE Iran

Thirteen species of rugose corals، belonging to nine genera are described from the Givetian and Lower Frasnian rocks of the Khoshyeilagh Formation in the Eastern Alborz Mountains (northeastern Iran). Glossophyllum ceratites (Goldfuss)، Glossophyllum sp.، Keriophyllum cf. maillieuxi (Tsien)، Pseudozaphrentis sp.، Temnophyllum imperfectum Coen-Aubert، Temnophyllum occidentale Hill and Jell، Temnophyllum sp.، Aristophyllum luetti Coen-Aubert and Spinophyllum blacourti (Rohart) come from the Givetian rocks and Neotemnophyllum sp.، Sinodisphyllum cf. posterum (Ivania)، Sinodisphyllum kielcense (Rozkowska) and Charactophyllum? nanum (Hall & Whitfield) belong to the Lower Frasnian strata. In spite of more or less remarkable endemism، the Givetian coral faunas of northeastern Iran show similarities with rugose corals of Germany، Belgium and Poland while the Lower Frasnian faunas reveal affinities with Eastern Asia as well as Europe corals.