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Definition of COLEOPTILE. : the first leaf of a monocotyledon forming a protective sheath about the plumule.
The word coleoptera is from the Greek ÎºÎ¿Î»ÎµÏÏ, koleos, meaning sheath; and ÏÏÎµÏÏÎ½, pteron, meaning wing, thus sheathed wing, because most beetles have two pairs of wings, the front pair, the  elytra , being hardened and thickened into a shell-like protection for the rear pair and the beetle's abdomen.or example, the known beetle diversity of Australia is estimated at 23,000 species in 3265 genera and 121 families. This is slightly lower than reported for North America, a land mass of similar size with 25,160 species in 3526 genera and 129 families.