i think they are tapping the phloem vessels because they can transport nutrients and they consist of living cells.
drill, needle, fingers, braces
The insect known as a devils darning needle is actually a dragonfly.
The three main types of insect mouth parts are chewing mouthparts, sucking mouthparts, and siphoning mouthparts. Chewing mouthparts are used for biting and chewing solid food, sucking mouthparts are used for sucking up liquids, and siphoning mouthparts are specialized for feeding on fluids like nectar.
A six-legged bug with a needle-like nose could be a sucking lice. They have small, needle-like mouths which they use to draw blood from the host.
A dragonfly is the insect that is sometimes called a darning needle. They were given this nickname because some cultures link them to evil things.
Ants
it does not have a mouth
Because an insect depends on it for survival, I guess.
The crop of an animal or insect comes between the mouth and stomach and allows them to store food.
Different types of insects may have different mouth parts. Five different types of insect mouth parts include the mandible, maxilla, labium, hypopharynx and proboscis.
A stylet is part of the mouth in some invertebrates. Aphids and tardigrades also have mouth parts that are called stylets. The stylet is sharp and is used to pierce things like plants and leaves.