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Hey,

here is a global view of the larvae moving in its environment






I've been surprised by this larva , 8 mm length, so different Vs the commun Tipulidae larvae I can see in a macroinvertebrate samples
ordinary collected to realise Global index (IBGN),
The larva is tiny (7 mm) and was living in filamentous algae with diffferent Chironomidae larvae and Cladocerans
The shape of the 6 papillae (4 longs and 2 shorter), 6 subconical lobes and spiracles (2) and other features invite me to name Tipula (Yamatotipula) larva

a view of its mouth




Is it enough to that ?


a partial view of the whole habitus





and a view of the spiracular place a little bit crushed by the destiny



As the larva is very juvenile, I could not see really a lot of "hairs" or longitudinal dark lines
but they are macroscopic setae present among little hairs as you can see on this picture





close-up to the spiracle, "dried"



Please, what could be the specific feature I have to observe to give a right name to this larva ?

Merci beaucoup
SDS

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Hello Solito
it is a young specimen as you already thought and juveniles cannot be identified to species level and even subgenus is difficult. Although T. (Yamatotipula) is the most common subgenus encountered in stagnant waterbodies it is only a wild guess. There are more subgenera with these combination of anal papillae. So Tipula spec. it is.

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Hello Atylotus
Nice to read you
I understand very well your opinion and vision of the facts
and I will use Tipula spec to determine this larva
You know that to evaluate quality water or biodiversity of a water sample, we use a 500µ sieve to filter the sample and so separate microinvertebrates and macroinvertebrates, as the normalised process ask it to do.
So, we have sometimes very tiny larvae (between 500µ and 1mm) but we have nevertheless to determine them till the family (here Tipulidae was enough) but evolving standards will require increasingly determinations to species in the future...(when it's possible of course)
Thanks a lot

here is the clip
The first part (00.00" to 38:00" result of Wild Herrbrugg binocular stereomicroscop recording.

YouTube Video



SDS