nightfly's picture

Caterpillar parasite.

Observed: 5th August 2011 By: nightflynightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebrates
3rd Aug 11 (185)
3rd Aug 11 (185)
3 august11 (14)
Description:
Identifications
Species interactions

No interactions present.

Comments

nightfly's picture

David,I found an interesting

David,
I found an interesting variety of insect life in the stomach of a brown trout which I caught, approx 1.5 hours prior to recording the caterpillar image, I am going to add it in as an edit- the stomach contents.

I think I see braconidae and ichneumonidae present?

Cathal.

DavidNotton's picture

Stomach contents

Can't see any braconids, the hymenopterans look like they are all ichneumonids, but fascinating to see so many in a single trout, I would have expected mainly diptera/ aquatic insects.

nightfly's picture

Is the one immediately below

Is the one immediately below the largest insect, in the lower right of the image not possibly a braconid?

I could be seeing an antenna but possibly an ovipositor? It seems very straight and rigid and seems to be protruding from an abdomen.

Then again, this could be a feature of some ichneumons for all I know.

Caddis and froghopper made up the bulk of the food items. This is only a small part of the stomach contents.

Thanks

Cathal.

DavidNotton's picture

Ichneumonidae

I think that's an ichneumonid, most likely subfamily Banchinae, because of the large hypopygium (ventral plate just before the bas eof the ovipositor) also the wing venation (small/open areolet where there would be a large cell in a braconid). Many banchines and other subf. of ichnuemonids have a long ovipositor, and many braconids have a short one.

nightfly's picture

Thanks for this info and

Thanks for this info and clarification. In that case there is probably no relationship here between what was in the fishes gut and what was on the caterpillar.

I must keep my eyes peeled for adult braconidae when up in the hills this coming summer.

Thankyou.

Cathal.

nightfly's picture

Thanks for this ID Gavb, I

Thanks for this ID Gavb, I tried to have a look for microgastrinae adult images just now, the best I found was a selection of dead ones from Canada, it was difficult to tell what size they were. Some of them looked a bit like the adult insects Ive added in above -mostly black with yellow/orange legs.

I found an emperor moth cocoon in early March and it was full of small disused, quite old brown cocoons very similar in size to the fresh white ones above, I found this cooon very close to where the cat was photographed last summer. Possibly a very similar species if not the same species.

http://www.ispot.org.uk/node/251246

Cathal.