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 Muscidae or Tachinidae?
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| Gerard Pennards |
Posted on 08-04-2005 20:43
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 Member Location: Posts: 1914 Joined: 07.06.04 |
Dear all, THis one I found near Amsterdam in the Netherlands, it was about 5 mm in lenght. It was sitting on a tree trunk, basking in the sun. I first thought it was a kind of Muscidae, but I am not sure anymore! The specimen seems to have a Tachinid like wing venation, and a very broad frons. Can somebody give me a clue? Thanks in advance, Greetings, Gerard 
Edited by Gerard Pennards on 08-04-2005 20:44 |
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| Laurens van der Leij |
Posted on 08-04-2005 23:08
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Member Location: Posts: 10 Joined: 20.07.04 |
Could it be Pollenia spec. (Calliphoridae)? |
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| Zeegers |
Posted on 10-04-2005 20:06
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Member Location: Posts: 18446 Joined: 21.07.04 |
Hoi Gerard, Definitely a Tachinid. Difficult to determine based on the picture. Given the circumstances: early spring on tree stems an educated guess would be: Campylochaeta praecox. This species is easily recognized by the ocellar bristles (the strongest bristles between the ocelli) being reclinate (= curved backwards). In nearly all Tachinidae they are proclinate. So, let me know. Theo Zeegers |
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| Gerard Pennards |
Posted on 10-04-2005 21:46
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Member Location: Posts: 1914 Joined: 07.06.04 |
Thanks, Laurens and Theo. I thought about Pollenia myself, but after I while a realised that Pollenia looks different, and then I started thinking about Tachinidae. Unfortunately I didn't catch it, it escaped after I made the picture. Maybe I will see another one the coming days, then I will try to catch one! So for now I will keep up with the name Theo provided! Greetings Greetings, Gerard Pennards |
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| Gerard Pennards |
Posted on 10-04-2005 21:53
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Member Location: Posts: 1914 Joined: 07.06.04 |
And a more detailed picture of the head. Does it help? Greetings 
Greetings, Gerard Pennards |
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| Zeegers |
Posted on 18-04-2005 20:02
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Member Location: Posts: 18446 Joined: 21.07.04 |
The ocellar bristles appear to be proclinate, so much for Campylochaeta ! My last guess (I know, three is a charm, I'm just trying to keep the level just a little bit of scientific hear): it might be Cyzenis albicans. Features: tibia reddish. On the frons: parafrontals (the lateral stripes between ocelli and antennal base) with 1 pair of strong proclinate setae (in both sexes !) This lack of sexual dimorfism is quite special in Tachinidae: in 90 % of the species the females have 2 pairs of proclinate setae on the parafrontals, whereas males have none. Otherwise, I pass. Theo Zeegers |
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but don't see the image in the post.
