Check-lists
* List of countries might not be complete
Links and literature
[1] 
Perner J., Barrande J. (1903): Systême Silurien du centre de la Bohême IV. Gastéropodes 1, Prague [as Calloconus avus Perner, 1903]
Data retrieved on: 8 October 2019
Perner J., Barrande J. (1903): Systême Silurien du centre de la Bohême IV. Gastéropodes 1, Prague [as Calloconus avus Perner, 1903]Data retrieved on: 8 October 2019