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==Description== Adult Curculionidae can be recognised by the well-developed, downwards-curved snout ([[Rostrum (anatomy)|rostrum]]) possessed by many species, though the rostrum is sometimes short (e.g. Entiminae).<ref name=":0">{{Cite web |title=Coleoptera {{!}} What Bug Is That? |url=https://anic.csiro.au/insectfamilies/biota_details.aspx?OrderID=25407&BiotaID=26524&PageID=families |access-date=2022-09-29 |website=anic.csiro.au}}</ref><ref name=":1">{{Cite web |title=Family Curculionidae - Snout and Bark Beetles |url=https://bugguide.net/node/view/139 |access-date=2022-09-28 |website=bugguide.net}}</ref> They have elbowed [[Antenna (biology)|antennae]] that end in clubs, and the first antennal segment often fits into a groove in the side of the rostrum.<ref name=":0" /><ref name=":1" /> The body tends to be robust, convex, heavily sclerotised and covered in scales or bristles.<ref name=":0" /> Curculionidae range in size from 1–35 mm long, usually being 5–15 mm long.<ref name=":1" /> Most Curculionidae are [[Sexual dimorphism|sexually dimorphic]] with females (compared to males) having antennae positioned more basally and a longer, thinner rostrum.<ref name=":1" /> Larval Curculionidae are C-shaped and lightly sclerotised, with minute antennae, robust mandibles<ref name=":0" /> and no legs.<ref name=":2" /> Most weevils feed on plants as larvae and adults, and they include important pests of cultivated plants that chew holes in fruits, nuts and other parts.<ref name=":1" /> The long rostrum possessed by most adult weevils is used by females to help lay eggs (oviposit) inside plant tissue.<ref name=":2" /> Some feed on rotten wood or bark (e.g. Cossoninae and Cryptorhynchinae), and some are [[Woodboring beetle|wood-borers]] that feed on [[ambrosia fungi]] (Platypodinae and some Scolytinae).<ref name=":0" />[[File:Curculionidae . Curculio elephas (33105941022).jpg|thumb|''[[Curculio elephas]]'']] Although pesticide resistance hasn't historically been an issue with these insects, recently a mutation was discovered in association with the voltage-gated sodium channel in the species ''[[Maize weevil|Sitophilus zeamais]]'', indicating there is a lot to learn about how these insects adapt to changing environments.<ref>{{Cite journal|last1=Araújo|first1=Rúbia A.|last2=Williamson|first2=Martin S.|last3=Bass|first3=Christopher|last4=Field|first4=Linda M.|last5=Duce|first5=Ian R.|date=2011|title=Pyrethroid resistance in ''Sitophilus zeamais'' is associated with a mutation (T929I) in the voltage-gated sodium channel|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2583.2011.01079.x|journal=Insect Molecular Biology|language=en|volume=20|issue=4|pages=437–445|doi=10.1111/j.1365-2583.2011.01079.x|pmid=21496128 |s2cid=205307830 |issn=1365-2583}}</ref> [[File:Pissodes_pini_(Linnaeus,_1758).png|alt=Pissodes_pini_(Linnaeus,_1758)|thumb|''[[Pissodes pini]]'']]
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