What is the name of the needlelike mouth part of a nematode?

The needlelike mouth part of a nematode is referred to as a stylet. This specialized structure is used by nematodes to pierce the tissues of host plants or prey, allowing them to feed effectively. The stylet plays a crucial role in the nematode's ability to extract nutrients, contributing to its survival and success in various environments.

The other terms included in the choices refer to different mouthparts belonging to other types of organisms. For example, mandibles are typically found in insects and are used for biting and grinding food. The proboscis is often associated with moths, butterflies, and some other kinds of insects, serving primarily for sucking liquids. Beaks are characteristic of birds and some cephalopods, adapted for grasping and tearing food. Each of these structures has distinct functions tailored to the feeding habits of the organisms they are associated with, highlighting the diversity of modes of feeding in the animal kingdom.