Gorjansky, V. Y. (1969). Bezzamkovye brakhiopody kembriiskikh i ordovikskikh otlozhenii severo-zapada russkoi platformy [Inarticulate brachiopods of the Cambrian and Ordovician deposits of the northwest Russian platform]. Ministerstvo Geologii RSFSR Severo-Zapadnoe Territorialnoe, Geologicheskoe Upravlenie [Ministry of Geology of the RSFSR, North-West Territorial, Geological Administration]. St. Petersburg (Leningrad), 6: 1-173.

original description

Holmer, L. E.; Popov, L. E.; Ghobadi Pour, M.; Zhang, Z.; Zhang, Z. (2017). Unusual pitted Ordovician brachiopods from the East Baltic: the significance of coarsely pitted ornamentations in linguliforms. Papers in Palaeontology. 3(3): 387-399.

additional source

Treatise on Invertebrate Paleontology. (1997-2007). Part H revised, Brachiopoda. Geological Society of America, Boulder; and University of Kansas Press, Lawrence,. vol. 1-6.

basis of record