The genus contains a single species, Paradoxosisyra groehni and is placed into the extinct subfamily Paradoxosisyrinae.

At the time of the genus description, the specimen was residing in the Geological-Paleontological Institute and Museum's C. Gröhn collection, part of the University of Hamburg.

Makarkin's 2016 type description of the new genus and species was published in the journal Cretaceous Research.

[3] While the placement and structure of the gonocoxites on the females abdomen and the general wing venation are most similar to genera of Sisyridae, a number of characters distinguish Pa. groehni.

There are several raised dome like calluses that are covered in setae and unlike other member of Sisyridae, the pronotum sclerite is present.