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Diptera.info :: Identification queries :: Diptera (adults)
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Female Cricotopus bicinctus -> ok
CedricMondy
#1 Print Post
Posted on 30-06-2021 17:47
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Location: Île-de-France (France)
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Joined: 30.06.21

Hi everyone,

First post here. This is a female chironomid I found in my city, close to Paris in France. Using the handbook for the identification of British Chironomidae, I found Cricotopus bicinctus. This was also posted on insecte.org and Eugène Vandebeulque thought it was a good idea but that deserves confirmation here, so here am I.

Thank you for your help!

Cédric


www.galerie-insecte.org/galerie/image/dos285/big/P1628921.jpg
Cédric Mondy : France : Saint-Maur-des-Fossés : 94100 : 02/05/2021
Altitude : 40 m - Taille : 2.8 mm
Réf. : 285013
Edited by CedricMondy on 11-03-2022 14:18
 
John Carr
#2 Print Post
Posted on 30-06-2021 18:09
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Location: Massachusetts, USA
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It could be Cricotopus bicinctus. There is a similar species C. vierriensis which is known from France but not the UK. Hirvenoja (1973) noted a size difference:

Flügellänge der untersuchten Populationen 2.0 (1.5 - 2.5) mm. [...] bicinctus
Flügellänge 1.8 (1.5 - 1.9) mm [...] vierriensis

The omitted parts relate to bristles on the legs which are not visible here.
 
http://www.flickr.com/photos/31715949@N00
CedricMondy
#3 Print Post
Posted on 30-06-2021 18:42
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Location: Île-de-France (France)
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Thank you John!
So, for this one with a wing length of about 2.5mm it would be too long for vierriensis and therefore confirm bicinctus, am I right?
 
John Carr
#4 Print Post
Posted on 30-06-2021 18:50
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CedricMondy wrote:
Thank you John!
So, for this one with a wing length of about 2.5mm it would be too long for vierriensis and therefore confirm bicinctus, am I right?


If Hirvenoja's size range is correct and there are no two-banded species in other species groups. I only looked at the key to the bicinctus group.
 
http://www.flickr.com/photos/31715949@N00
CedricMondy
#5 Print Post
Posted on 30-06-2021 18:52
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Yes, I understand! Thank you for your help and the information!
Cédric
 
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