-In the East-Central Iran, the Sardar Formation (upper Visean-Moscovian) consists of shallow-water limestone with intercalations of shale containing rugose corals, tabulate corals and brachiopods. Ten sections were sampled in the Ozbak-kuh Mountains, from north to south. Among the rugose corals, an assemblage of fasciculate Kleopatrinidae has been collected. The latter contains the species: Paraheritschioides antoni antoni, P. antoni minor, P. gracilis and two new species for the genera Fomichevella and Heintzella. Heintzella is described from Iran for the first time. However, its age, as determined by conodonts and foraminifers, is early to middle Bashkirian (early late Carboniferous). The most similar, time-equivalent faunal associations are that of the Ellesmere Island, Sverdrup Basin in Arctic Canada, Alexander terrane and Brooks Range in southeastern Alaska and eastern Klamath terrane in northern California, where similar tropical warm water conditions have been identified during the Bashkirian in the northern hemisphere. During these times central Iran block and Northern provinces, characterized by a dominant carbonate facies and more diversified colonial coral faunas.Key words: Iran, Ozbak-kuh, Sardar, Bashkirian, rugose corals. RESUMO -A Formação Sardar (Viseano superior-Moscoviano) no Irã Central-Leste é caracterizada por calcários de ambientes pouco profundos com intercalações de folhelhos que contêm corais rugosos, tabulados e braquiópodes. Foram estudadas dez amostras das montanhas Ozbak-kuh, de norte a sul. Entre os corais rugosos foi amostrada uma associação de Kleopatrinidae fasciculados, que contém as espécies Paraheritschioides antoni antoni, P. antoni minor, P. gracilis e duas novas espécies novas para os gêneros Fomichevella e Heintzella. O gênero Heintzella é descrito pela primeira vez para o Irã. Contudo, a sua idade, determinada por conodontes e foraminíferos, é Bashkiriano inicial-médio (Neocarbonífero). As associações faunísticas contemporâneas mais semelhantes são as da Ilha de Ellesmere, bacia Sverdrup no Canadá Ártico, Terreno Alexander e Cordilheira Brooks no sudeste de Alasca, e o Terreno Klamath mais a leste na Califórnia setentrional, onde condições de águas quentes tropicais foram identificadas durante o Bashkiriano no hemisfério norte. O bloco central iraniano e as provincias setentrionais, durante este tempo, foram caracterizadas por facies calcárias dominantes e faunas coralinas coloniais diversificadas.

Most Alcyonacea (subclass Octocorallia) have skeletons made up of small calcareous pieces called sclerites that are difficult to both preserve and recognize, which explains the scarce and irregular fossil record of the group. In this work, we study 56 geological samples bearing Syringoalcyon, a genus constituted by Alcyonacea represented by sclerites encrusting the outer walls and stolons of a syringoporoid coral. These samples come from 18 Silurian to mostly Carboniferous localities in Canada, USA, Mexico, Morocco, Algeria, Spain, Iran, and China. A morphological and numerical study was carried out to determine the main morphological and palaeobiological features of the sclerites and the Alcyonacea itself and to establish a new genus for these sclerites. The study facilitated distinguishing four sclerite morphotypes (spindle, elongate spindle, club, and arrowhead). Live sclerites can be attached through biotic or abiotic linkages to biotic substrate patches by insertion or cementation. Spindle sclerites arranged in vertical fences are the most common model, but other arrangements such as stacking or short horizontal fences have been observed even in a single specimen. The morphotypes, dimensions of the sclerites, substrates, and types of arrangement observed are well known in Recent Alcyonacea. According to the arrangements of the sclerites, the alcyonacean morphology was different depending on the shape and dimensions of the substrate. This Syringoporidae–Alcyonacea association is a good example of ecological engineering, but several data suggest that the relationship between these two corals was closer than hard substrate colonization.