author(s)
GS Mirzoev and I Kh. Alekperov

abstract
The present paper presented the distribution of organisms on the biotopes of macrozoobenthos in the shelf zone of the Azerbaijan sector of the South Caspian, showing the relationship of species diversity of benthic organisms on the types of soil, Comparing the species diversity of four biotopes showed that species diversity is richer than all on the shelly-silt. Only 157 species belonging to 10 taxonomic groups, among which 54 species were observed for the first time in this part of the Caspian Sea. Minimum indices of qualitative and quantitative development of macrozoobenthos were observed on the biotope of the clayey silt, on which only 33 species belonging to 6 taxonomic groups were observed.