Taxon - Links and literature
Štorch P. (2023): Graptolite biostratigraphy and biodiversity dynamics in the Silurian System of the Prague Synform (Barrandian area, Czech Republic), Bulletin of Geosciences 98(1), 1–78 [as Huttagraptus billegravensis Koren' & Bjerreskov]
Štorch P. (2015): Graptolites from the Rhuddanian–Aeronian boundary interval (Silurian), Prague Synform, Czech Republic, Bulletin of Geosciences 90(4), 841–891 [as Huttagraptus billegravensis Koren’ & Bjerreskov, 1997]