In this survey, six species of Brachionus genus are indexed as new record in the south Iraqi water resource at first time Iraq depending on sequence 18S rRNA gene, these were registered a and other two which HH1 HH2 National Center for Biotechnology Information (NCBI), The European Nucleotide Archive (ENA) DNA Data Bank Japan (DDBJ) sequentially.

Samples of Rotifera genus Brachionus were collected from Al-Barka and Al-Nagara region in Al- Hammar Marsh, South Iraq. Remarks on the taxonomy notes 6 species a monthly density each recorded during study period Feb-2006 to Jan-2007.The highest value total was 2.78 ind /l May -2006, whereas lowest 0.01 reported March-2006.

Steroids play fundamental roles regulating mammalian reproduction and development. Although sex steroids and their receptors are well characterized in vertebrates and several arthropod invertebrates, little is known about the hormones and receptors regulating reproduction in other invertebrate species. Evolutionary insights into ancient endocrine pathways can be gained by elucidating the hormon...