Taxon - Links and literature
Havlíček V., Vaněk J. (1966): The Biostratigraphy of the Ordovician of Bohemia, Sborník geologických věd, Paleontologie, 8 [as Monotrypa kettneri Prantl]
Ernst A., Kraft P., Zágoršek K. (2014): Trepostome bryozoans from the Zahořany Formation (Upper Ordovician) of Loděnice, Prague Basin, Czech Republic, Paläontol Z, 88:11–26 [as Monotrypa kettneri Prantl, 1941]