Scenedesmus obliquus and Acutodesmus obliquus are currently regarded as a taxonomic synonym of Tetradesmus obliquus (Turpin) M.J.Wynne. This information is based on Algaebase... You can check it using this link:
Thank you for the reply. As you might have seen, some authors put the two together as Scenedesmus obliquus ( Acutodesmus obliquus). Synonym is sometimes confusing me (is it referring to something same but possessing "TWO" names?)