ntroduction of one of the genus from crustaceans belong to branchiopoda class from Streptocephalus - (Anostraca) in Dasht-e- Kavir of IRAN (Damghan) 2008

According to study of crustaceans species and ecological notability of them in Semnan province, the kind of crustacean was identified in the vernal pool in Damghan's Kavir of (Iran). By the identifying keys,biometric and biomeristic specification (Antena and appendix of them, numbers of tagmata, swimming foots,egg pouch, and eyes and numbers, shape and sizes of cysts,were studied. The samples were identified from branchiopod class and Streptocephalus genus that belonged to Streptocephalidae family. In biological study, from September to November 2008, 35 samples of females,averagely had 85 eggs. Body size in male from 21.3 to 29.82mm and female from 16.13 to 18.14mm was different. In the ecological study, the environmental place,included salt water of shaft with 18000 EC, and was mixed in syllable. Until now, there have not been any reports from this genus of branchiopods in Semnan province. For more identification, Samples collected, were sent to the Ecoanalytic center in USA.