Keresztes, Lujza, Kappert, Juergen, Henning, Maria & Toeroek, Edina, 2021, Helen's twins in the Balkans: discovery of two new Paraptychoptera Tonnoir, 1919 species closely related to P. helena Peus, 1958, with systematic revision of the " lacustris " group (Diptera, Ptychopteridae)

Keresztes, Lujza, Kappert, Juergen, Henning, Maria & Toeroek, Edina, 2021, Helen's twins in the Balkans: discovery of two new Paraptychoptera Tonnoir, 1919 species closely related to P. helena Peus, 1958, with systematic revision of the " lacustris " group (Diptera, Ptychopteridae), ZooKeys 1071, pp. 63-81

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https://dx.doi.org/10.3897/zookeys.1071.58598

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https://dx.doi.org/10.3897/zookeys.1071.58598

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