This organism belongs to a sample of freshwater phytoplankton collected in the end of 2018. Does it depict asexual reproduction in Staurastrum or it's just an image imperfection?
If the centrally smaller and rather hyaline structures are semi-cells then, judging from their large chloroplasts I think IT IS an image of Staurastrum undergoing asexual reproduction. If you can ascertain the centrally located pyrenoid within the chloroplast in your sample then without a doubt it is an instance of asexual division of desmid cell.