Weevils are beetles belonging to the superfamily Curculionoidea, known for their elongated snouts. They are usually small – less than 6 mm in length – and herbivorous. Approximately 97,000 species of weevils are known. They belong to several families, with most of them in the family Curculionidae. It also includes bark beetles, which while morphologically dissimilar to other weevils in lacking the distinctive snout, is a subfamily of Curculionidae. Some other beetles, although not closely related, bear the name "weevil", such as the biscuit weevil, which belongs to the family Ptinidae.

நீள்மூஞ்சி வண்டு என்பது நீளமான முகத்தைக் கொண்ட கேர்குயிலியொனொய்டியே சிறப்புக் குடும்பத்தைச் சேர்ந்த வண்டினம் ஆகும். இதில் ஏறக்குறைய 60,000 வகைகள் காணப்படுகின்றன.