What specific trait is a hallmark for identifying *A. nerii*?
Answer
Pronounced blackness of the cornicles on a bright yellow body
While many yellow aphid species exist, entomologists seek specific, consistent combinations of features to confirm identification, especially for *Aphis nerii*. Although they possess black legs and antennae, the single most defining visual hallmark sought on a bright yellow body is the pronounced blackness of the cornicles projecting from the rear abdomen. This feature stands out sharply because, in many other species, these tubes often blend in color with the rest of the body, making the stark black contrast a reliable marker for *A. nerii*.
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