Sentence:  This difference in the description of the species, and the lack of agreement as to whether the <WSD>rangeable</WSD> Parts are all Non-significant, are worth noting, for they constitute evidence of a genuine Stoic debate, and serve as a reminder (like the apparently distinct approaches to Elleipsis and Pleonasm) that there was no single, authoritative Stoic classification. 
Meaning of the word marked with <WSD> tags:  Varying within a range.