I was telling someone that "platyhelminthes" is the last phylum which shows organ (and the only phylum) level of organization and after that all other phylas show "organ system level of organization". Now how's this question related to English? Well, I want to know how I can naturally express it.
After platyhelminthes all the phylas show organ system level of organization.
From aschelminthes on all the phylas show organ system level of organization. (Aschelminthes too shows organ system level of organization)
So what would sound natural "after" or "from......on"? What do you think?