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#1 2014-08-21 17:20:48

pbrighto
DF Members
Name: Phil Brighton
From: Warrington
Registered: 2011-10-21
Posts: 357

Meigenia (Tachinidae)?

I am hoping for confirmation of this as Meigenia, having keyed it out using Belshaw.  The latter says that the sexes are of different colours, without saying what colour.  This is not very helpful, but perhaps accounts for why pictures I've found on diptera.info look different.  It is not unlike the Meigenia shown on the Tachninid recording scheme website.

Examination of the genitalia of this male, about 7-8mm long, indicate dorsalis rather than mutabilis.  The former has been previously recorded near here, which is encouraging.  In  the lateral view you can sharply upturned apical bristles on the scutellum which is a distinguishing feature for this genus, though whether this is unique to it is not clear from Belshaw.


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Last edited by pbrighto (2014-08-21 17:25:05)

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#2 2014-08-21 22:23:43

ChrisR
Administrator
Name: Chris Raper
From: Reading, UK
Registered: 2008-03-08
Posts: 393
Website

Re: Meigenia (Tachinidae)?

Hmm, how about Exorista rustica (group)? smile  Not sure where you went wrong but it is a male so pull out the genitalia (should be covered in ginger hair) and expose sternite 8 for a good ID smile

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#3 2014-08-22 00:24:09

pbrighto
DF Members
Name: Phil Brighton
From: Warrington
Registered: 2011-10-21
Posts: 357

Re: Meigenia (Tachinidae)?

Yep - Exoristica rustica it is!   I've traced back to Couplet 82 on the extent of hairs on vein R4+5.  The actual node itself is quite long, and I think I looked at the extent of the hairs in toto rather than from the distal end of the node, leading to the conclusion that the hairs extended over half-way. The genitalia diagrams were certainly easier to relate to the specimen.  Thanks for your help!

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#4 2014-08-22 00:57:35

ChrisR
Administrator
Name: Chris Raper
From: Reading, UK
Registered: 2008-03-08
Posts: 393
Website

Re: Meigenia (Tachinidae)?

No worries Phil - it's a common species in high summer, usually on umbellifers but you have to keep catching them (discard females) because you'll come up with the other 2 every now and then when you least expect them wink  Exorista tubulosa is very similar to rustica and mimula is usually a bit smaller and greyer but that only really becomes apparent when you have a few of them wink

Anyway, send in the records when you're ready - they're all useful to the scheme big_smile

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