The book presents new data, obtained by the author in the process of work on the confirmed theme of the five-years report of laboratory of paleontology and stratigraphy of the Institute of Geology, Earthquake Engineering and Seismology of the Academy of Sciences of the Republic of Tajikistan. The part of results represents the outcome of research shined in doctoral work and the book of the author on the Heliolitida of the Upper Ordovician of South Tien Shan. The revision and correlation of the complexes of the Heliolitida of the Upper Ordovician and the analysis of taxonomical criteria, by which the author was guided at monograph research, are spent for the first time.Due to the ambiguity of the opinions of different researchers concerning a rank, an origin, the phylo-morphogenesis of the Heliolitida and construction of their systems, evidences are provided in favor of the sights of the author generated as the result of long-term studying of named group of corals. The book is intended to paleontologists and biologists that interested by problems of morphology, systematization and evolution of Paleozoic corals, as well as to geologist-stratigraphers.

Ospanova Narima K. is Dr of geological-mineralogical sciences, the main research scientist of Institute of Geology, Earthquake Engineering and Seismology, has more than 100 publications. Focus of interest is morphology and evolution of the Paleozoic corals, evolution as a whole and properties of live substance. 4 copyrights certificates.