Siphunculi Paired funnel-like structures located on the dorsum of the fifth or sixth abdominal segments of the Aphididae. They excrete substances that repel natural enemies. Website https://www.google.co.il/search?q=siphunculi+aphid&biw=1536&bih=824&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjMt9q-_IrLAhWDXBoKHcTdA_4QsAQIMw
