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Diptera.info » Identification queries » Diptera (adults)
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Another Atylotus
Smoggycb
Photographed on an area of waste ground equidistant between saltmarsh and grazing marsh.
 
Smoggycb
Another view
 
Smoggycb
...and another
 
Zeegers
Congratulations.
This is (95 % sure) latistriatus.

If you can see hairs on the eyes with a 10 x loup, it's 100 %
(have a good look again dark background !)


Theo
 
Zeegers
I think I can even see some hairs on the pictures (??)

Theo
 
Smoggycb
Thanks Theo. I have checked the eyes and they appear to be sparsely pale hairy using a 20x lens. Is that still ok for latistriatus?
 
Smoggycb
Actually, the hairs appear quite dense from some angles, though they are still quite difficlt to see
Edited by Smoggycb on 30-07-2007 20:15
 
Zeegers
Yes, that's it. It is not soo easy to see, but in rusticus you see completely nothing with a hand lens. Moreover, the pattern on the tergites is slightly different, the legs and notopleurae are more yellow and so on (all very subtle, agreed)
So you got both rusticus and latistriatus in the same locality in two weeks time !

Theo
 
Tony T
Head shots agree nicely with Verrall's (1909) description of the female eyes "opalescent green with peculiar shifting spots according to the poinrt of view, and these spots are rather few in number and not arranged in rows, but there is also a slight crossband"
 
Smoggycb
Thanks Theo and Tony. It was the eyes which really drew me to this one in the first place (quite apart from being a large horsefly which always gets my attention!). Both of these species are new to the reserve I work on, though I think I am the first warden who has had any real interest in diptera. However, as i have been here for several years and always have my eyes open for horseflies they must be pretty thinly spread and it does make me wonder about Theo's migrant suggestion in my earlier Atylotus thread, particularly in relation to the A. rusticus record. I've certainly had a few migrants in my moth trap over the last few weeks.
 
Tony T
We have several spp. of Atylotus in New Brunswick (Canada) and all are extremely habitat specific. From the few I have seen, and I've been chasing them for 33 years, they are sluggish flyers and keep low down in the vegetation. They don't give the impression of even being capable of migration. I would not be surprised if most species, including UK ones, are autogenous for the first gonotrophic cycle. If so, this may account for their apparent rarity. Try running a Malaise trap on the marsh.
 
Zeegers
be assured that latistriatus is a fierce biter !
(other than many other Atylotus, as correctly observed)


Theo

 
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10 October 2025 03:27
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17.08.23 15:23
Aneomochtherus

17.08.23 13:54
Tony, I HAD a blank in the file name. Sorry!

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Tony, thanks! I tried it (see "Cylindromyia" Wink but don't see the image in the post.

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pjt - just send the post and attached image. Do not preview thread, as this will lose the link to the image,

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