Rhynchonellata - Athyridida - Athyrididae

Alternative combination: Spirigera peracuta

Synonyms: Spirifer sextensis Stache 1878, Spirigera janiceps Stache 1878

Belongs to Janiceps according to R. Posenato 2001

Sister taxa: Janiceps bipartita, Janiceps cadorica, Janiceps emarginatiformis, Janiceps lozovskyi, Janiceps ogbinensis, Janiceps papilio

Average measurements (in mm): shell 15.3 x 19.6, valve 16.5 x 21.9