Diptera.info

Posted by javanerkelens on 31-05-2009 15:53

28-may-2009 Amsterdam Artis , about 2-3mm

I'm a bit lost whit this one...i think Sphaeroceridae, but got the strong feeling...it is not.

Joke van Erkelens

Edited by javanerkelens on 05-11-2014 22:02

Posted by javanerkelens on 31-05-2009 16:41

Interfrontals present, frontals strongly to outside bent.....maybe Canacidae..?

Joke van Erkelens

Edited by javanerkelens on 31-05-2009 16:43

Posted by javanerkelens on 31-05-2009 19:53

Canace nasica not found yet in the Netherlands (only Xanthocanace ranula, but looks different)
It was found in a Zoo(on the ground near water), so when it is a Canace nasica, I think it wil be a doubtful species!

Thanks Joke

Posted by Tony Irwin on 05-11-2014 18:24

It feels good to raise this 5-year old thread and set the record straight. Not Canace, but a sphaerocerid, as Joke first thought - Pseudocollinella humida, a species that looks very like both Canaceidae and Ephydridae. The long arista gives it away, and although the hind metatarsus does not appear to be swollen, it is short.

Posted by Ectemnius on 05-11-2014 18:35

Hello Tony,

I'm glad you did raise the topic. I caught a female Canace nasica in September at Terneuzen, Zeeland The Netherlands. The only photo of a Dutch specimen I found was the photo by Joke. However my specimen is much more gray in the face then shown here. Also the bristles under the eyes are enormous on my specimen yet not visible in the photo. So you're reply cleared my confusion about these and my specimen.

Greetings,

Ectemnius

Posted by Tony Irwin on 05-11-2014 18:46

Hi Ectemnius - see http://www.dipter...d_id=64112 for a recent specimen from the Netherlands, collected by Niels. Ruud has also taken a couple this year. Perhaps the three of you can get together to publish it as new to the Netherlands? :)

Posted by javanerkelens on 05-11-2014 22:07

#10

And again, it shows how photos can be confusing.
I also must confess, that I was a little surprised, Tony still had kept this thread in his memory..... compliment!
And for Elias...you have to search for another 'live' photo of Canace nasica and see you next saturday.

Johanna

Posted by Paul Beuk on 07-11-2014 09:56

#11

Tony Irwin wrote:
It feels good to raise this 5-year old thread and set the record straight. Not Canace, but a sphaerocerid, as Joke first thought - Pseudocollinella humida, a species that looks very like both Canaceidae and Ephydridae. The long arista gives it away, and although the hind metatarsus does not appear to be swollen, it is short.

As I wrote to Tony:

this certainly is not Pseudocollinella humida. It is one of the regular victims of my window surveys in the museum and it is not [this] brownish in aspect and does not have the whitish face and genae. Moreover, the face appears to be swollen (like in ephydrids) and I am not familiar with that in our sphaerocerids. Admitted, it was collected in the zoo and [could] be of an entirely exotic origin, but I still cannot think of this as a sphaerocerid.

Posted by Tony Irwin on 07-11-2014 11:23

#12

And to use Paul's phrase - "Well, that puts me back in my place again! :D"
All I can say is that there are several images purporting to be P.humida on-line, which seem to me to be the same species, e.g http://www.discov...mp;res=640

Posted by Paul Beuk on 07-11-2014 15:10

#13

Okay, I concede: I pulled one of my Pseudocollinella's from alcohol, dried it and under rather strong (white) light it does give that brownish hue and the face amd genae light up. My impression of the degree of the swelling face may have been influenced by the angle of the shot. P. humida is one of the more common species and certainly turns up in 'ephydrid' favouring conditions.

That shows that it is something completely different to collect the blackish flies from windows with the light in your face and identifying flies from pictures taken using flash. :D