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These larvae and 1 single pupa was found on littoral stones in the river IJssel at Kampen, The Netherlands (24.iv.2024) and I can only see any resemblance with Elliptera omissa (or perhaps Elliptera hungarica of which I have no description). I have also checked with eastern Palaearctic species in Podeniene et al (2021) and they look quit similar. Except for the pigmentation on the anal lobes in the larvae it all seem to fit. The larvae of E. omissa supposedly do not have any pigmentation but I think that may have been a misjudgment, not sure though. Other Elliptera species do have similar pigmentation of the anal lobes (Podeniene et al 2021). The head is alo entirely black.
So, is there anybody that can verify my specimens with Elliptera, omissa or hungarica? and is there any recent paper describing either of these 2 species?
Thanks
Ton a.k.a atylotus

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habitus larvae dorsal

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pupa habitus lateral

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pupa thoracic horn dorsal, thorax slightly damaged

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larvae with closed anal lobes

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I'm pretty much convinced that these are indeed the larvae and pupae of E. omissa. Thanks to Niels-Jan Dek I got the originals of Mik (1886) and Alexander (1920) and it all seem to fit with E. omissa. In the originals of Mik as well as in the translation in Alexander they clearly write that the anal lobes are bordered with a black lining. This can be seen in the original drawings of Mik but for some reason this is omitted in the Alexander drawings. This Alexander-drawing is copied in subsequent papers and interpreted by some authors as having no pigment(stripes) but this is actually false. Also the pupa clearly fits with the original drawings and in my opinion relates to a male pupa. The size and shape of the thoracic horn, the presence of dorsal en ventral pseudopods in 2-7 in larvae and pupae and the black head are all diagnostic

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originals in Mik (1886)