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Hi, :)

I was wondering if this is the Common Alderfly Sialis lutaria ?
I have two of these in my folders, but this one somehow looks different;
Its head and neck look less hairy and the wings look shorter, darker too.
I also see a kind of brownish colar around its neck just under the head, perhaps it's a just a gender difference..
Any help very much appreciated! :)

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this is not Neuroptera. It belongs to the Megaloptera order, now.
The Megaloptera were formerly considered part of a group then called
Neuroptera, together with lacewings and snakeflies.

It is Sialis. For species I do not know.

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Thanks Jorge for that info! :)
Still wondering though if this is the common Alder Fly..

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The other Belgian species are very rare and associated with clean streams. I thought that they can only be distinguished by examination of the genitals. So, probably it is Sialis lutaria, but Sialis cf. lutaria is in fact beter.

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Thanks Jorgen! :)
I see you're from Belgium too!
I found it in the local Nature Reserve, the Bourgoyen in Gent.
No clean streams there so I suppose it must be the Common Alderfly Sialis lutaria then..