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 unknown fly pupa with anal hooks
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| atylotus |
Posted on 15-03-2012 09:58
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 Member Location: Posts: 1112 Joined: 29.05.09 |
This pupa was found in a ditch in the southwestern part of the Netherlands (Goeree, 15.ix.2011). In habitus it reminds me of an Ephydridae but it has some typical features unlike any Ephydridae I have ever seen. At the posterior edge of the anal segment there a two large ventral hooks, just in front of the posterior stigma. The anal segment itself appears rugose by its numerous smaller hooks. The other abdominal segments are almost bare, except for the the ventral pseudopods which has two rows of larger hooks. The posterior stigma has 3 curved slits, the anterior stigma has a few lobes (difficult to count, but it appears as having 4-5 stigma), as in many other Ephydridae. Does anybody recognize this specimen? |
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| Tony Irwin |
Posted on 15-03-2012 23:44
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 Member Location: Posts: 7168 Joined: 19.11.04 |
You've stumped me with this one! Hopefully you can rear some adults ... 
Tony ---------- Tony Irwin |
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| Cranefly |
Posted on 16-03-2012 06:37
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Member Location: Posts: 646 Joined: 17.09.08 |
15.ix.2011.... No chance to rear???  |
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| Cranefly |
Posted on 16-03-2012 06:45
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Member Location: Posts: 646 Joined: 17.09.08 |
Something like such structures (posterior hooks )present on pupa of Allotrichoma (Pseudohecamede) abdominale, the figure of which is given in "First symposium on the systematics and ecology of Ephydridae", 1979, but general type of the pupa structure is different (anterior part much longer and posterior breathing tubes much shorter)
Edited by Cranefly on 16-03-2012 06:46 |
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| atylotus |
Posted on 16-03-2012 09:21
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Member Location: Posts: 1112 Joined: 29.05.09 |
no chance in rearing it, most pupa don't react that well to ethanol In most cases we/I get preserved material for identification. Only If I collect it myself during sorting, it has a chance of survival. Our team (private company) processes over 600 aquatic invertebrate samples a year, so there isn't much time (and money) for rearing. In the past I have reared some Ceratopogonidae en Ephydridae, but I'm not keen on adults and there isn't time  |
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| Tony Irwin |
Posted on 16-03-2012 11:26
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Member Location: Posts: 7168 Joined: 19.11.04 |
If there are any specimens from a late winter or spring collection, they might contain pharate adults - usually it is possible to see whether adult structures are present. If so, it may be possible to identify the genus. 
Tony ---------- Tony Irwin |
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| atylotus |
Posted on 29-01-2015 14:31
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Member Location: Posts: 1112 Joined: 29.05.09 |
Same place, same pupa, but now EXACTLY 3 years later (15.ix.2014). I was able to photograph the cephalopharyngeal skeleton and the anterior spiracle. The latter has 7 lobes. Still have no idea. A yet undeveloped, and consequently unidentifyable, adult was present within the pupal case. |
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| atylotus |
Posted on 29-01-2015 14:33
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Member Location: Posts: 1112 Joined: 29.05.09 |
head... |
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| dxj616 |
Posted on 29-06-2023 18:25
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Member Location: Posts: 22 Joined: 22.11.21 |
Late reply but it is a puparium of Sepsis sp. (Sepsidae) |
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| atylotus |
Posted on 06-07-2023 12:28
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Member Location: Posts: 1112 Joined: 29.05.09 |
Thank you very much. Although late, i still appreciate your answer because untill now I still didn't know what it was All the best |
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but don't see the image in the post.