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Acorn weevil
Acorn weevil


Acorn weevil
The acorn weevil (Curculio venosus) is a species belonging to the genus Curculio (Curculio glandium), in the order beetles (Coleoptera), the suborder Polyphaga, the infraorder Cucujiformia, the superfamily snout beetles (Curculionidea), the family true weevils (Curculionidae), the subfamily Curculioniae and the tribe Curculionini. The acorn weevil is widespread in the northern hemisphere (Europe and Asia) where oak trees grow (hardwood zone). It is found with varying frequency and is rare in Northern Europe.
Acorn weevil - Curculio glandium
Acorn weevil - Curculio glandium
The acorn weevil reaches body lengths of 4 - 9 mm. Its colouration varies from reddish-brown to yellowish-brown. The head of the beetle is extended by a long proboscis and is as long as the female body and only slightly shorter than the male’s. Due to its appearance, the acorn weevil can be confused with a related species, the hazelnut weevil (Curculio nucum). They can be differentiated by their body size: the acorn weevil is slightly smaller, and by the size of the probe beam - in the hazelnut weevil it is twice as long as wide, while in the acorn weevil the length is three times the width.
Curculio glandium - Curculionidae
Curculio glandium - Curculionidae
Acorn weevil live everywhere in the distribution area of the oak and are found from May to August come in deciduous forests, parks, or sometimes in gardens. After mating, the fertilized females look for an unripe acorn hanging on a tree, which they pierce with their long proboscis. When they have penetrated deep enough into the core, they lay 1, 2 or sometimes more eggs. As the acorn grows and matures the hole closes from the outside. Approximately 2 weeks later, the beetle larvae hatch from the eggs.
Weevils - Snout Beetle - Acorn weevil - shows his wings
Weevils - Snout Beetle - Acorn weevil - shows his wings
Acorn weevil larvae are 9 - 10 mm long. Their bodies are yellowish-white in colour and without legs. The head is reddish-brown and lacks eyes. The larvae eat out the core of the acorn. In autumn, when the damaged acorns fall from the tree, the larvae, which have now reached their full size, bore their way out and dig into the ground, where they settle themselves in small chambers about 250 mm beneath the surface of the ground for the purpose of overwintering. In the following spring, the larvae pupate in their chambers. They leave the pupae in May or June as adult acorn weevils.
Curculio glandium on his back
Curculio glandium on his back
Curculio glandium depends again on
Curculio glandium depends again on

Curculio (Curculio) glandium
Common namesAcorn weevil
German namesEichelbohrer, Gewöhnlicher Eichelbohrer, Gewöhnliche Eichelbohrer
Dutch namesKleine eikelboorder
AuthorMarsham, 1802
Distribution
Continents:

Eurasia
Europe
North Europe (British Isles (United Kingdom (Great Britain (England (English Midlands (East Midlands (Leicestershire)))))), Germany (West Germany (North Rhine-Westphalia)), Scandinavia (Sweden, Denmark), Fennoscandia (Finland)), West Europe (Austria, France, Switzerland, Benelux (Belgium, Netherlands, Luxembourg)), South Europe (Italy (Italy Islands (Sicily, Sardinia), North Italy, South Italy), Iberian Peninsula (Spain)), Central Europe (Poland, Czech Republic (Moravia, Bohemia), Slovakia), Southeast Europe (Bulgaria, Greece, Yugoslavia (Croatia, Macedonia)), East Europe (Belarus)
Asia
West Asia (Near East (Turkey))
Africa
North Africa
Morocco


Ecozones: Palaearctic

Distribution by Synonymus:
Curculio cinereus   North Europe
Curculio turbatus   CJ., 1836 -, L. in Schönherr
CountriesAustria, Belarus, Belgium, Bulgaria, Croatia, Czech Republic, Denmark, Finland, France, Germany, Greece, Italy, Luxembourg, Macedonia, Morocco, Netherlands, Poland, Slovakia, Spain, Sweden, Switzerland, Turkey, United Kingdom
Links and ReferencesCurculio glandium in dyntaxa.se
Curculio glandium in Wikipedia (English)

Description of images / photos
Photography with Cameras
Nikon D3x, Nikon D300, Canon 50D
Image editing with Photoshop
1. Acorn weevil
2. Acorn weevil - Curculio glandium
3. Curculio glandium - Curculionidae
4. Weevils - Snout Beetle - Acorn weevil - shows his wings
5. Curculio glandium on his back
6. Curculio glandium depends again on
Quick search: Acorn - Weevil - Beetle - Curculio - Snout - Curculionidae
Oak - Beetles - Larvae - Wings - Adult - Eat - Tree - Red
Sources, links and more informations
Curculio glandium in species.wikimedia
Taxonomy
ClassInsecta
Insects, True insects
SubclassPterygota
Winged insects
InfraclassNeoptera
Wing-folding insects
SuperorderHolometabola
Holometabolous Insects
OrderColeoptera
Beetles, Coleopterans
SuborderPolyphaga
Polyphags
InfraorderCucujiformia
SuperfamilyCurculionoidea
Weevils, Snout Beetles and Bark Beetles, Bark Beetles
FamilyCurculionidae
True weevils, Ambrosia beetles, Weevils, Snout Beetles and Bark Beetles, Snout beetles, Amycteridae, Aquatic weevils, Bark beetles, Scout beetles
SubfamilyCurculioninae
Flower weevils, Acorn weevils, Nut weevils
TribeCurculionini
SubtribeCurculionina
GenusCurculio
Nut weevils and Acorn weevils
SubgenusCurculio
Nut weevils and Acorn weevils
Speciesglandium
Curculio glandium
Acorn weevil
AuthorMarsham, 1802
 
Synonyms
Balaninus turbatus
Curculio anatolicus
Curculio cinereus
Curculio filirostris
Curculio hispanus
Curculio montivagus
Curculio tesellatus
Curculio turbatus
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