Genus: Phreatophasma EFREMOV, 1954
Etymology:

Species: aenigmaticum EFREMOV, 1954
Etymology:

Holotype: PIN 294/25

Locality: Santagulov Mine, on the Dema River, Bashkortostan (Baskir) Province, European Russia.

Horizon:

Biostratigraphy: Golyusherm Subassemblage, Zone I.

Age: Lower Part of the Kazanian Substage, Wodian-lower Capitanian Stage, Guadelupian Stage, Lower Zechstein Epoch, Early Late Permian.

Material: Right femur.

Note: Original is lost (Brocklehurst & Frobish, 2017).