jan_rix's picture

Wood-boring weevil

Observed: 17th November 2010 By: jan_rixjan_rix’s reputation in Invertebratesjan_rix’s reputation in Invertebratesjan_rix’s reputation in Invertebrates
Wood-boring weevil 1
Wood-boring weevil 2
Wood-boring weevil 3
Wood-boring weevil 4
Description:

dead weevils fell from wood following timber treatment for woodworm. weevils make these ragged holes and tunnels rather than the very round holes of the woodworm according to pest eradication websites

Identifications
Species interactions

No interactions present.

Species with which Euophryum confine interacts

Comments

jan_rix's picture

John

please could you expand. I had tried to make a differential ID between these 2 choices but had been unable to find any info on the significant differences between them, and according to some sites, they seemed to be interchangeable terms. Euophryum originated from NZ so I went with the indigenous Pentarthrum, (although realise that as this is in France, may be irrelevant!) but did wonder how I would know. Do you have any more info? thanks!

markgtelfer's picture

Cossonine weevils

Euophryum confine is by far the commonest of this group of weevils in Britain, despite being an alien. The species can be identified using Mike Morris' RES Handbook "True Weevils (Part 1)".
http://www.field-studies-council.org/publications/res.aspx

Martin Harvey's picture

Euophryum/Pentarthrum

Mike Morris's key first of all splits Euophryum and Pentarthrum from other genera in the subfamily using number of segments in the flagellum (central portion) of the antennae. Euophryum has a raised keel at the tip of the elytra that is not present in Pentarthrum.

In Britain there are two species of Euophryum (E. rufum and E. confine) and one of Pentarthrum (huttoni); none of them are native, with Euophryum originating in New Zealand and Pentarthrum thought to come from Chile.

Mike Morris says that Pentarthrum huttoni is present in France, and that Euophryum rufum isn't, and he implies (but doesn't actually state) that Euophryum confine isn't known from France either, but it's always dangerous making guesses at identification based on distribution, especially for small weevils with the propensity for being transported in timber!

----
Entomologist and biological recorder

jan_rix's picture

Martin

thank you! the house is very old, the beams in question 1690 and fairly rural so perhaps P. huttoni after all, although I appreciate that we may never know definitively. thank you all!

John Bratton's picture

Nothing useful I can add to

Nothing useful I can add to the above.

John Bratton