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This small Ephydrid (some 3 mm) was abundant in dry grasses with pools of water in a birch forest near Copenhagen. Along equally numerous Paracoenia fumosa.

I suppose it is Coenia sp. but according to the genus key in the palaearctic manual Coenia sp. should have an absent or very weak and short postpronotal seta. The specimens I caught all have a postpronotal of about the same size as the posterior notopleural. Going by the book it should be at most 1/4 as long.
So either am I looking at the wrong bristle or this is something other than Coenia sp.

If it turns out to be Coenia sp. after all how do you separate the species?

Collected 22. iii 2010 near Copenhagen.

Greetings,