Austrosipho Cossmann, 1906: synonym of Penion P. Fischer, 1884
Berylsma Iredale, 1924: synonym of Penion P. Fischer, 1884
Largisipho Iredale, 1929: synonym of Penion P. Fischer, 1884
Verconella Iredale, 1914: synonym of Penion P. Fischer, 1884 (unnecessary substitute name for Penion, by Iredale assumed to be a junior homonym of Penium Philippi, 1865.)
Cotton, B. C. & Godfrey, F. K. (1938). A systematic list of the gastropoda the marine, freshwater and land univalve mollusca of south and central Australia. Adelaide: Malacological Society of South Australia. 44 pp.