There are seven species in this genus if we think of "Lysapsus" as a different genus. Until the late 1990s and early 2000s, most scientists said only "P. minuta" and "P. paradoxa" counted as frogs in "Pseudis". Scientists wrote the first paper about "P. cardosoi". Before that, scientists thought "P. cardosoi" was the same frog as "P. minuta". All the other species remaining were thought to be subspecies, synonyms or populations of "P. paradoxa". Not all scientists agree that "P. platensis" is not the same frog as "P. paradoxa".