Which gland produces the silk used by a larva in cocoon spinning?

The thoracic salivary gland is responsible for producing the silk that larvae use in the process of cocoon spinning. This gland is specifically adapted for secreting silk proteins, which are then expelled through the larva's spinnerets. The silk helps protect the developing pupa by providing a safe environment during its transformation from larva to adult.

Although the other glands mentioned are involved in different physiological processes, they do not play a direct role in silk production. The abdominal gland may facilitate various other functions, such as digestive or excretory tasks, while the mandibular and maxillary glands are primarily associated with producing substances that assist in feeding or hive maintenance, rather than silk for cocooning. Understanding the specific functions of these glands highlights the specialized roles each plays in the life cycle of insects, particularly in the context of cocoon formation in larvae.