[3] The German zoologist Karl W. Verhoeff first described this species in 1928 based on specimens including adults of both sexes and one juvenile.

[5] Authorities initially believed this species to be endemic to Abaligeti Cave, where this millipede was found in the deepest part of the main passage and in a hall 300 m below the surface.

[6] In 1965, the Romanian zoologist Ionel Tabaracu described Orobainosoma hungaricum orientale as a new subspecies based on specimens collected from caves in the Banat and Oltenia regions in Romania.

[9] Others find the minor differences in morphology cited by Tabaracu to be too variable and therefore deem Orobainosoma hungaricum orientale to be a junior synonym of Haasea hungarica.

[10][8] This millipede can be distinguished from all other species in the genus Haasea based on the unique structures on the anterior gonopods in males.

[6] This species arrives at lower numbers of segments and legs through a process of post-embryonic development that deviates from the anamorphosis usually observed in the order Chordeumatida.