Diptera.info :: Identification queries :: Diptera (adults)
 Spectacular unknown genus from French Guiana
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| jorgemotalmeida |
Posted on 24-04-2010 11:18
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 Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
Hi Yesterday I received the first bunch of French Guiana flies... and I could appreciate all the night my favourite family with this unknown genus and Ocnaea specimens. Enjoy this spectacular acrocerid. Well, this is not Lasia. I just realized that wing venation doesn't fit. R1 and R2+3 joins in one vein near the wing margin! In Lasia sp. Vein R2+3 ends in costa SEPARATE from R1! I will upload more later the photo of wing venation! jorgemotalmeida attached the following image:  [193.47Kb] Edited by jorgemotalmeida on 24-04-2010 13:20 |
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| jorgemotalmeida |
Posted on 24-04-2010 11:18
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Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
another..
jorgemotalmeida attached the following image:  [186.78Kb] |
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| jorgemotalmeida |
Posted on 24-04-2010 11:19
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Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
another...
jorgemotalmeida attached the following image:  [190.19Kb] |
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| jorgemotalmeida |
Posted on 24-04-2010 13:13
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Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
another. Well, this call my attention because the wing venation doesn't fit for Lasia specimens. Lasia has R2+3 clearly separated from R1 vein which is not the case. Also the ripples in the wing are rather strong. There is an undescribed genus similar to this one except in the R4 vein.. Here the vein R2+3 ends in R1. Even the R4 ends before wing margin reaching near the junction of R2+3 with R1! Later I must check out the empodium.. jorgemotalmeida attached the following image:  [183.98Kb] Edited by jorgemotalmeida on 24-04-2010 13:13 |
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| jorgemotalmeida |
Posted on 24-04-2010 13:31
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Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
another... the R4 vein joins in junction of R2+3 and R1 not in the wing margin.
jorgemotalmeida attached the following image:  [191.75Kb] Edited by jorgemotalmeida on 24-04-2010 13:32 |
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| nielsyese |
Posted on 24-04-2010 14:17
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 Member Location: Yerseke, NL Posts: 2370 Joined: 13.02.09 |
Spectacular, George! But I can't help you |
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| jorgemotalmeida |
Posted on 24-04-2010 14:26
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Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
I contacted Dr. Evert, world Acroceridae expert. If he didn't describe the species yet... Also I'm waiting for Dra. Emilia expertise. If none answer I will describe it in summer. Now, busy... it requires time I do not have now. Thanks, Nielsyese. |
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| Nosferatumyia |
Posted on 24-04-2010 18:52
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 Member Location: Posts: 3553 Joined: 28.12.07 |
The reason that none of specialists is rushing to describe a taxon does not seem to me a good reason for an amateur, even the one feeling a true love to insects, to describe it by himself. Perhaps it is wiser to keep describing and naming pending until more material comes up to make a good and exhausting taxonomic revision than to pick one single species... Am I wrong?
Val |
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| jorgemotalmeida |
Posted on 24-04-2010 18:54
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Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
You are right, Valery. I agree totally that we need much more specimens. Unfortunately, acrocerids are not easy to find. However, I have two specimens that have the same features. So it is not an aberrant version of Lasia (highly improbable). I will wait for Evert and Emilia answer. I'm sure Evert will tell something about this fly. Thanks for your comment, Valery. Edited by jorgemotalmeida on 24-04-2010 19:05 |
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| Eric Fisher |
Posted on 24-04-2010 19:25
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 Member Location: California Posts: 435 Joined: 19.05.06 |
Jorge, That is a spectacular fly; congratulations! I believe Valery gave you excellent advice regarding the possible description of this fly. Furthermore, I think the value of the minute distinction in position of vein R4 (between your specimen and "Undescribed Genus C"  is so trivial that it makes for a very poor choice as a generic character! In robber flies, for example, such a minor character is subject to much variation, and I know of quite a few species where that type of difference is seen between the left and right wings of the same specimen. It seems very likely that your specimen represents "Undescribed Genus C" -- and that we need to wait for Evert to describe it...Cheers, Eric |
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| jorgemotalmeida |
Posted on 24-04-2010 20:03
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Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
Yes, I know that one specific character is not enough. but there are also other features that fits well in this one that appears in MCAD. I didn't tell that was another species - just pointed the slight difference, no more. I know that there are many variations not just in wing venation (besides the colour of the specimens) in same species. I am aware of these possibilities. The best for now is waiting for the Evert's opinion. Thanks, Eric.
Edited by jorgemotalmeida on 24-04-2010 20:06 |
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| Nosferatumyia |
Posted on 24-04-2010 20:13
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Member Location: Posts: 3553 Joined: 28.12.07 |
The fly is incredible! My own experince with acrocerids was very productive: I was sittin on the edge of a canyon and caught them swarming around my head - with my hand: it was more effective than a net! twenty specimens in half hour! Val |
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