In his famous book Glimpses of World History, Jawaharlal Nehru writes (p. 610, Penguin 2004 Edition, emphasis mine):
As I have been telling you of Darwin's theory of the origin of species, it might interest you what a Chinese philosopher wrote on the subject 2500 years ago. Tson Tse was his name, and he wrote in the sixth century before Christ, about the time of the Buddha:
All organizations are originated from a single species. This single species had undergone many gradual changes and continuous changes, and then gave rise to all organisms of different forms. Such organisms were not differentiated immediately, but, on the contrary, they acquired their differences through gradual change, generation after generation.
If this quotation were accurate, it would be a clear anticipation of common descent and evolutionary gradual change, both of which are key ideas presented in Charles Darwin's On the Origin of Species. It would both predate and be more similar to modern thought than other early evolutionary writings such as those by Lucretius.
The problem is: I can't find any source for the quote besides Nehru's book. Additionally, a web search for "Tson Tse" does not turn up even a single mention of a philosopher by that name (does he mean Zhuangzi?). At the same time, I see no reason why Nehru would invent such a minor detail irrelevant to his main political agenda, so I assume there must be at least one source of that claim which predates him.
My question, therefore, is: Did a Chinese philosopher living approximately 2500 years ago, whose name could be transliterated to Tson Tse, write anything that, when translated to modern English, approximately yields the above quotation?