What is Leaf beetle?
{{Automatic Taxobox | name = Leaf beetles | image = Scarlet lily beetle lilioceris lilii.jpg | image_caption = Scarlet lily beetle ''[[Lilioceris lilii]]'' in [[Oxfordshire]], [[UK]] | taxon = Chrysomelidae | authority = [[Pierre André Latreille|Latreille]], 1802&nbsp;<ref>{{ITIS |id=114509 |taxon=Chrysomelidae}}</ref> | subdivision_ranks = Subfamilies | subdivision = See text }} [[File:Monocesta coryli larva on ulmus americana.jpg|thumb|right|230px| ''Monocesta coryli'' [[larva]] on ''Ulmus americana'', the American [[elm]]]] '''Leaf beetles''' are the [[family (biology)|family]] '''Chrysomelidae'''. There are over 35,000 [[species]] in more than 2,500 [[Genus|genera]], so it is one of the largest and most common of all [[beetle]] families. Many [[subfamilies]] are recognized. Leaf beetles have a [[tarsal formula]] which appears to be 4-4-4, but is actually 5-5-5.<ref>{{cite web| title = Family identification – Chrysomeloidea| publisher = University of Florida| url = http://eny3005.ifas.ufl.edu/lab1/Coleoptera/Chrysomelid.htm| accessdate = 2006-11-29| archive-date = 2006-10-13| archive-url = https://web.archive.org/web/20061013233916/http://eny3005.ifas.ufl.edu/lab1/Coleoptera/Chrysomelid.htm| url-status = dead}}</ref> Some are difficult to tell from [[long-horned beetle]]s (family [[Cerambycidae]]): it is done by the [[antenna (biology)|antennae]] ''not'' arising from frontal [[tubercle]]s. Adult and [[larva]]l leaf beetles feed on all sorts of plant tissue. Their [[biodiversity|diversity]] has run parallel with that of the [[Angiosperms]].<ref name=Grimaldi/> Many are serious [[pests]] of [[Cultivar|cultivated plants]], for example the [[Colorado potato beetle]] (''Leptinotarsa decemlineata''), the [[asparagus beetle]] (''Crioceris asparagi''), the [[cereal leaf beetle]] (''Oulema melanopus''), and various [[flea beetle]]s. A few act as vectors of plant diseases. Others can be used as [[biocontrol]] of invasive [[weed]]s. Most Chrysomelidae are conspicu