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I am no expert in Diptera but identified this to be Culiseta morsitans by using the key by Utrio (1976). The larva is from southern Finland and was collected in early spring from a temporary pond. I would appreciate your comments on the id, thank you.



Reference: Utrio, P. 1976. Identification key to Finnish mosquito larvae (Diptera, Culicidae). Annales Agriculturae Fenniae 15: 128–136

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a detailed photo of the siphon would help but I would guess it is closer to Culex pipiens/torrentium. But when you say it is from a temporary waterbody Aedes/Ochlerotatus would be more likely. But showing the positions of the hairs on the siphon would help to ID.

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Does this help?

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These were collected at the same time but may be a different species and not fully-grown:

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I still think that the first one is Culex, but the second group of species are in fact Aedes/Ochlerotatus. Siphon is much shorter...too short for Culex, but good enough for Culiseta/Aedes/Ochlerotatus. But as the watebody is temporary, Aedes/Ochlerotatus would be the best possible guess.

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Many thanks for your comments, atylotus.