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Linked to an explanation in the text: https://en.wikipedia.org/wiki/Proboscis
Wikipedia prefers the term proboscis, but it's the same:

"In invertebrates, the term usually refers to tubular mouthparts used for feeding and sucking."

Proboscis
A proboscis is an elongated appendage from the head of an animal, either a vertebrate or an invertebrate. In invertebrates, the term usually refers to tubular mouthparts used for feeding and sucking. In vertebrates, a proboscis is an elongated nose or snout.