Dear Monia Elbarhoumi,
since your letter does not tell me what kind of reproductive studies you are planning to do, I would suggest to look into the two comphrehensive volumes on annelid reproduction:
A.W.C. Dorresteijn, W. Westheide (eds.) (1999) Reproductive strategies and developmental pattern in annelids. Developments in Hydrobiology 142, Kluwer, Dordrecht.
G. Rouse, F. Pleijel (eds) Reproductive biology and phylogeny of Annelida. Vol. 4. Reprod. Biol. Phyl. Science Publishers, Enfield.
Best wishes,
W. Westheide
