Check-lists
* List of countries might not be complete
Links and literature
[1] Žítt J., Nekvasilová O., Hradecká L., Svobodová M., Záruba B. (1998): Rocky coast facies of the Unhošť-Tursko high (Late Cenomanian-Early Turonian, Bohemian Cretaceous Basin), Acta Musei Nationalis Pragae, Series B [as Hyotissa semiplana (Sowerby)]
Žítt J., Nekvasilová O., Hradecká L., Svobodová M., Záruba B. (1998): Rocky coast facies of the Unhošť-Tursko high (Late Cenomanian-Early Turonian, Bohemian Cretaceous Basin), Acta Musei Nationalis Pragae, Series B [as Hyotissa semiplana (Sowerby)]