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Diptera.info :: Identification queries :: Other insects, spiders, etc.
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Insect's larva ?
pat_der2003
#1 Print Post
Posted on 10-04-2020 13:42
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Location: Paris area, France
Posts: 1706
Joined: 20.08.07

Hello,

In freshwater at the riverbank, April 09th 2020, France, 30km from PAris city.

About 0,85 mm / 850 µm ...

I'm wondering if it could be a fly's larva ? Or an annelid ? Or ... ?

In the picture below, a scale = 10 µm
pat_der2003 attached the following image:


[113.27Kb]
Edited by pat_der2003 on 10-04-2020 13:42
 
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pat_der2003
#2 Print Post
Posted on 10-04-2020 13:43
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Location: Paris area, France
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the head and body
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[120.08Kb]
 
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pat_der2003
#3 Print Post
Posted on 10-04-2020 13:43
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Location: Paris area, France
Posts: 1706
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head and body
pat_der2003 attached the following image:


[150.2Kb]
 
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pat_der2003
#4 Print Post
Posted on 10-04-2020 13:44
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Location: Paris area, France
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head not contracted
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pat_der2003
#5 Print Post
Posted on 10-04-2020 13:45
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Location: Paris area, France
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head again, contracted


Thank you in advance !! Smile
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Tony Irwin
#6 Print Post
Posted on 10-04-2020 18:10
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Location: Norwich, England
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Probably an oligochaete. The "Y" shaped mouth is typical of leeches (though I think this one is in the wrong orientation), but only one order of leeches (Acanthobdellida) bears setae on the body, and they don't have an anterior sucker. So I would say an oligochaete or one of the few freshwater polychaetes (family Aeolosomatidae) - although this latter group do not appear to have setae on the prostomium.
Tony
----------
Tony Irwin
 
pat_der2003
#7 Print Post
Posted on 11-04-2020 06:36
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Location: Paris area, France
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Many many thanks, Tony !! Smile
 
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atylotus
#8 Print Post
Posted on 13-04-2020 14:04
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Location: Amsterdam, NL
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Most likely Chaetogaster setosus. A small Oligochaete species with only simple pointed chaetae on the ventral side. This species is probably one of the smallest freshwater Oligochaete worldwide. Other Chaetogaster species have bifid chaetae and all other oligochaetes have dorsal and ventral chaetae. Did you collect it? I would like to have an ethanol preserved specimen.
It is no Aeolosomatidae for members have bundels of hairs dorsally and ventrally and NO Acanthobdella for those members are strictly North east European.
Edited by atylotus on 13-04-2020 14:06
 
pat_der2003
#9 Print Post
Posted on 13-04-2020 20:49
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Location: Paris area, France
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Oh, Thank You very Much Atylotus !!Smile

Trying to follow the key "Thorp and Covich's Freshwater Invertebrates ", I was thinking of Aeolosoma species, but I was wrong for the absence of "bundels of hairs dorsally and ventrally" as you wrote ...
Thank you again.
Unfortunately the preparation went dry and it is lost ... Sad

May be next time !Smile

 
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23.09.21 15:29
All sorted.

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