So... is Genshi Shounen Ryuu finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: March 25, 1972
Manga finished: July 01, 1971
... But MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Genshi Shounen Ryuu tells the story of Ryuu, a boy rejected by his tribe at birth and raised by a monkey.
Years later, fate brings him back into contact with his original tribe and introduces him to a girl named Ran, who has her own tragic past.
When tragedy strikes, Ryuu and Ran are forced to embark on a journey together.
Their quest is driven by a search for family and a need to find where they truly belong in a prehistoric world filled with danger.