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Diptera.info :: Identification queries :: Diptera (adults)
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Cecidomyiidae? => Miastor metraloas
Ingrid Altmann
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Posted on 31-12-2019 10:57
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Hello,
on 18.5.15 I found unter bark this Diptera pupae (near Furth im Wald, Bavarian Forest, Bavaria, Germany). I took some of it home to breed them. These little red flies hatched on the 30.5.15. Length: 1,8 mm
Do they belong to the Cecidomyiidae?

Best regards
Ingrid
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Edited by Ingrid Altmann on 01-01-2020 18:36
 
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Ingrid Altmann
#2 Print Post
Posted on 31-12-2019 10:58
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next photo
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Ingrid Altmann
#3 Print Post
Posted on 31-12-2019 10:59
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pupae
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Edited by Ingrid Altmann on 31-12-2019 11:01
 
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Ingrid Altmann
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Posted on 31-12-2019 11:01
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pupae
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John Carr
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Posted on 31-12-2019 14:23
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It's probably one of the basal lineages of fungus-feeding Cecidomyiidae but I'll need to pull out some books. The eyes are unusually small. Can you tell how many tarsomeres they have?
 
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Ingrid Altmann
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Posted on 31-12-2019 14:48
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I think they have 4 tarsomeres?
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Posted on 31-12-2019 14:49
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another photo
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John Carr
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Posted on 31-12-2019 15:39
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Four tarsomeres (first longest), palps present, and not "buff-coloured" with "head and dorsum of thorax pale brown" should make them Miastor metraloas.

Quoting Wyatt (1967): "Larvae are readily found under the bark of rotting birch, where they often occur in large numbers and form dense star-shaped clusters. The decaying wood of many other trees may also be colonised to a lesser extent. The white larvae feed on the mycelium of wood-rotting fungi and reproduce by paedogenesis throughout the year."
Edited by John Carr on 31-12-2019 15:40
 
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John Carr
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Posted on 31-12-2019 15:49
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The structural difference between the two species of Miastor given by Wyatt is "first flagellar segment [of M. castaneae] twice as long as broad and twice as long as third segment (in M. metraloas this ratio is 1½)". The behavioral difference is "larvae were found in small numbers in the rotting bark of chestnut posts, not aggregated as are those of M. metraloas."
Edited by John Carr on 31-12-2019 15:49
 
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Ingrid Altmann
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Posted on 01-01-2020 18:06
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Dear John,
great! I would not have thought that a determination up to the species would be possible.
If I remember correctly, I indeed found the pupae under birch bark.
Thank you very much for your help and for the detailed description!

All the best!
Ingrid
 
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John Carr
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Posted on 01-01-2020 18:28
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Please submit some of these to the gallery.
 
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Ingrid Altmann
#12 Print Post
Posted on 02-01-2020 10:37
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I uploaded two photos. Smile
 
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