What color are the cornicles of the Oleander Aphid (A. nerii)?
Answer
Black
The Oleander Aphid, *Aphis nerii*, possesses appendages that contrast sharply against its bright yellow abdomen. Specifically, these aphids are characterized by having black legs, black antennae, and most notably, black cornicles (siphunculi). This pronounced blackness of the cornicles, projecting from the rear of the abdomen, is cited as a strong identifier for this specific species, especially when compared to many common green aphids where these structures might match the body color or only be slightly darker.
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