Diptera.info :: Identification queries :: Diptera (adults)
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 Cecidomyiidae? => Miastor metraloas
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| Ingrid Altmann |
Posted on 31-12-2019 10:57
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Member Location: Posts: 1018 Joined: 29.11.09 |
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 Ingrid Altmann attached the following image:  [159.71Kb] Edited by Ingrid Altmann on 01-01-2020 18:36 |
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| Ingrid Altmann |
Posted on 31-12-2019 10:58
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Member Location: Posts: 1018 Joined: 29.11.09 |
next photo
Ingrid Altmann attached the following image:  [116.62Kb] |
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| Ingrid Altmann |
Posted on 31-12-2019 10:59
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Member Location: Posts: 1018 Joined: 29.11.09 |
pupae
Ingrid Altmann attached the following image:  [154.11Kb] Edited by Ingrid Altmann on 31-12-2019 11:01 |
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| Ingrid Altmann |
Posted on 31-12-2019 11:01
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Member Location: Posts: 1018 Joined: 29.11.09 |
pupae
Ingrid Altmann attached the following image:  [126.9Kb] |
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| John Carr |
Posted on 31-12-2019 14:23
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 Super Administrator Location: Massachusetts, USA Posts: 10488 Joined: 22.10.10 |
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 |
Posted on 31-12-2019 14:48
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Member Location: Posts: 1018 Joined: 29.11.09 |
I think they have 4 tarsomeres?
Ingrid Altmann attached the following image:  [133.29Kb] |
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| Ingrid Altmann |
Posted on 31-12-2019 14:49
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Member Location: Posts: 1018 Joined: 29.11.09 |
another photo
Ingrid Altmann attached the following image:  [126.55Kb] |
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| John Carr |
Posted on 31-12-2019 15:39
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Super Administrator Location: Massachusetts, USA Posts: 10488 Joined: 22.10.10 |
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 |
Posted on 31-12-2019 15:49
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Super Administrator Location: Massachusetts, USA Posts: 10488 Joined: 22.10.10 |
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 |
Posted on 01-01-2020 18:06
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Member Location: Posts: 1018 Joined: 29.11.09 |
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 |
Posted on 01-01-2020 18:28
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Super Administrator Location: Massachusetts, USA Posts: 10488 Joined: 22.10.10 |
Please submit some of these to the gallery. |
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| Ingrid Altmann |
Posted on 02-01-2020 10:37
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Member Location: Posts: 1018 Joined: 29.11.09 |
I uploaded two photos.  |
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