I do not think that it has a specific name for only that. I am not a plant professional but I can tell you that number one; they aren't leaves and number two; It should only be called "the head of the Venus Flytrap closing". It also does not need a capital V since it is not the name of a planet, but the name of a plant (Venus).
Venus Flytraps have little hairs or sensors that whenever a fly lands on it, it triggers the "sensors" and it closes upon its prey.
The Venus Flytrap actually doesn't have a favorite insect... It likes just about any insect.
The Venus fly trap usually has about 7 leaves. If your Venus fly trap has more leaves, it probably means that it has branched off into separate plants.
Venus flytrap – rapid closure of specialized leaves in response to trigger hairs being touched by an insect, resulting in the trapping and digestion of the prey.
Response to stimuli.
The Venus Flytrap hunts by luring insects into the jaws of its trap. Inside the trap are glands that secrete nectar. This tricks the insect into thinking it has found a flower. The trap has small sensor hairs that are triggered by the moving insect. The sensor hairs triggering causes the trap to shut and trap the insect.
They are not dangerous to humans, however they can catch and digest an insect in around 10 days.
A behavioral adaptation of the Venus flytrap is its ability to close its specialized leaves in response to physical contact with prey. This helps the plant trap and digest insects for nutrients in nutrient-poor habitats.
A Venus fly trap catches insect that are attracted to the sweet smell it puts off. They land on the plant and the plant closes around them.
Venus flytraps catch insects by luring them into their trap using sweet nectar on their leaves. When an insect lands on the trigger hairs inside the trap, it quickly snaps shut due to a change in water pressure within the plant's cells, trapping the insect inside to be digested for nutrients.
The Venus fly trap has specialized leaves with many fine hairs. These leaves look and smell like food to flies; so, they land to investigate. When they do, they brush the fine hairs, letting the plant know that an insect is there. There is a fast change in turgor pressure in special cells at the hinge of the leaf, which causes the leaf to shut. The fly is then trapped. The plant then releases enzymes that will breakdown the fly. These breakdown products are absorbed into the plant and used for growth.