Acorn Weevil - Curculio glandium

Description

Length 4 to 8 mm. The most striking feature of the acorn weevil is its elongated snout, known as a 'rostrum', which is longer in females than males. Adults have a brownish and patterned body. Weevils in this genus can be hard to tell apart. C. glandium has 3 segments in the bulbous end of its antennae whereas C. nucum has 4 segments.

Similar Species

curculio.JPG

Curculio nucum and Curculio glandium are very similar but can be distinguished by the shape of the antennal club. C. glandium (on the left) has a narrower and more tapered club than C. nucum (on the right).

Identification difficulty
Recording advice

Unless identified by a recognised expert, photographic evidence is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used. Note the beetle's size and describe the identifying characters. It is advisable to retain the specimen in case further checks are needed.

Habitat

Lives in Oak trees.

When to see it

Peaking in summer and autumn.

Life History

The female uses the long rostrum (snout) to bore into the centre of an acorn to lay her egg. The larva feeds within the acorn and eventually bores its way out. The larvae are short, and cylindrical in shape, and move by means of ridges on the underside of the body.

UK Status

Relatively common, particularly in the south of Britain.

VC55 Status

Fairly frequent in Leicestershire and Rutland.

Leicestershire & Rutland Map

MAP KEY:

Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map

Species profile

Common names
Acorn Weevil
Species group:
Beetles
Kingdom:
Animalia
Order:
Coleoptera
Family:
Curculionidae
Records on NatureSpot:
27
First record:
30/05/2008 (Nicholls, David)
Last record:
12/04/2024 (Smith, Peter)

Total records by month

% of records within its species group

10km squares with records

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