[1] The specimen is preserved as a compression fossil in silty yellow to grayish mudstone, dating from the Lower Barremian to Upper Aptian in age, which was recovered from outcrops of the Yixian Formation.

[1] Undulopsychopsis was first studied by the paleoentomologists Yuanyuan Peng and Dong Ren from the Capital Normal University in Beijing with Xiaodong Wang from Chaoyang Bird Fossil National Geopark and Vladimir N. Makarkin of the Far Eastern Branch of the Russian Academy of Sciences.

[1] The branching vein structure seen in Undulopsychopsis is most similar to the Early through Late Cretaceous genus Kagapsychops which has been found in Kazakhstan and Japan.

The two genera can be distinguished by the overall size of the species, with Kagapsychops continentalis being two times as long in the forewing as Undulopsychopsis alexi.

[1] The combination of costal space which lacks numerous crossveins, along with the multi-branched Rs1 and 1A veins, is a feature set found in another extinct Neuropteran family, Osmylopsychopidae.