A weevil is any beetle from the Curculionoidea superfamily. They are usually small, less than 6 millimetres (0.24 in), and herbivorous. There are over 60,000 species in several families, mostly in the family Curculionidae (the true weevils). Some other beetles, although not closely related, bear the name “weevil”, such as the biscuit weevil (Stegobium paniceum), which belongs to the family Anobiidae. Many weevils are damaging to crops. The grain or wheat weevil (Sitophilus granarius) damages stored grain. The boll weevil (Anthonomus grandis) attacks cotton crops. It lays its eggs inside cotton bolls, and the young weevils eat their way out. Weevils are often found in dry foods including nuts and seeds, cereal and grain products, such as pancake mix. In the domestic setting, they are most likely to be observed when a bag of flour is opened. Their presence is often indicated by the granules of the infested item sticking together in strings, as if caught in a cobweb. Beetle is an insect scientifically called coleoptera. The word “coleoptera” is from the Greek κολεός, koleos, meaning “sheath”; and πτερόν, pteron, meaning “wing”, thus “sheathed wing”. The reason for the name is that most beetles have two pairs of wings, the front pair, the “elytra“, being hardened and thickened into a sheath-like, or shell-like, protection for the rear pair, and for the rear part of the beetle’s body. The superficial consistency of most beetles’ morphology, in particular their possession of elytra, has long suggested that the Coleoptera are monophyletic, but there is growing evidence that this is unjustified, there being arguments for example, in favour of allocating the current suborder Adephaga their own order, or very likely even more than one.