Check-lists
* List of countries might not be complete
Links and literature
[1] Kraft P., Kraft J., Prokop R. J. (2001): Possible hydroid from the Lower and Middle Ordovician of Bohemia, Alcheringa: An Australasian Journal of Palaeontology, 25:2, 143-154 [as Webbyites rokycanensis (Bouček, 1956)]
Kraft P., Kraft J., Prokop R. J. (2001): Possible hydroid from the Lower and Middle Ordovician of Bohemia, Alcheringa: An Australasian Journal of Palaeontology, 25:2, 143-154 [as Webbyites rokycanensis (Bouček, 1956)]
[2] Kraft J. (1975): Dendroid Graptolites of the Ordovician of Bohemia, Acta Mus. Nat. Prague, 31, 3 - 5 [as Thamnograptus rokycanensis Bouček, 1956]
Kraft J. (1975): Dendroid Graptolites of the Ordovician of Bohemia, Acta Mus. Nat. Prague, 31, 3 - 5 [as Thamnograptus rokycanensis Bouček, 1956]