Sawfly or wasp ?

[Lord V]

Guessing this is a sawfly but not certain - taken yesterday sitting on a sunchair- about 6mm body length.

Thanks for any ID info
Brian v.

[poschiavanus]

Definitely a sawfly. The indentations on the top of the 'thorax' are typical and it has 9 antennal segments. I presume its a Tenthrindid, but as this family includes about 80% of all British sawflies, that's not very useful.

The wing venation might provide a bit more help, but I don't have the keys handy right now.

[Jason Green]

Evening Brian,

I have a feeling it's a Dolerus species (dark colour, downy surface...), but unlike Martin I lack any keys whatsoever!

Take care,

Jason

[oxycera]

Doesn't look right for Dolerus somehow; suspect it may be a nematine.

[Lord V]

Thanks for the sawflly confirmation and ID ideas so far
Brian v.

[peterbolson]

Definately in the subfamily Nematinae ( vein R2 absent - this is the vein which starts from the stigma and divides cell R into two ). Have you any other pictures of the wing venation as this would help to take identification further ?
Peter

[Lord V]

Originally Posted by peterbolson

Definately in the subfamily Nematinae ( vein R2 absent - this is the vein which starts from the stigma and divides cell R into two ). Have you any other pictures of the wing venation as this would help to take identification further ?
Peter

Thanks for the ID work Peter- appreciated
Fraid I haven't got any more dorsal shots.
Brian v.

[watsthat]

I have been struggling with this and when I saw the subject of this thread I thought I had the same insect. However; on closer inspection, the antennae are very different. Would I be on the right lines with Ichneumon sp and can someone enlighten me as to the significance of the no. of segments when trying to identify.


Cheers

Pete

[oxycera]

It's a Stonefly (Plecoptera).
In some insects the male of a species has an extra antennal segment.