Siphonotretoidea Kutorga, 1848

Selection of related publications
Nemliher, J., Kurvits, T., Kallaste, T., Puura, I. 2004. Apatite varieties in the shell of the Cambrian lingulate brachiopod Obolus apollinis Eichwald. Proceedings of the Estonian Academy of Sciences. Geology 53, 4, 246-256.
Holmer, L. E., Biernat, G. 2002. Lingulate brachiopods from Lower Ordovician (Tremadoc) chalcedonites, Holy Cross Mountains, Poland. Acta Palaeontologica Polonica 47, 1, 141-156.
Holmer, L. E., Popov, L. E. 2000. Class Lingulata. Treatise on Invertebrate Paleontology, part H Brachiopoda, pp. 30-146.
Wright, A. D., Nõlvak, J. 1997. Functional significance of the spines of the Ordovician lingulate brachiopod Acanthambonia. Palaeontology 40, 1, 113-119.
Puura, I. 1996. Lingulate brachiopods and biostratigraphy of the Cambrian-Ordovician boundary beds in Baltoscandia. Doctoral Thesis, pp. 1-214.
Holmer, L. E. 1989. Middle Ordovician phosphatic inarticulate brachiopods from Västergötland and Dalarna, Sweden. Fossils and Strata 26, 1-172.
Popov, L. E., Khazanovitch, K. K., Borovko, N. G., Sergejeva, S. P., Sobolevskaya, R. F. 1989. The key sections and stratigraphy of the Cambrian-Ordovician phosphate-bearing Obolus beds on the north-east Russian Platform. Опорные разрезы и стратиграфия, pp. 1-222.
Popov, L., Nõlvak, J. 1987. Revision of the morphology and systematic position of the genus Acanthambonia (Brachiopoda, Inarticulata). Proceedings of the Academy of Sciences of the Estonian SSR. Geology 36, 1, 14-19.
Kaljo, D., Borovko, N., Heinsalu, H. Khazanovich, K., Mens, K., Popov, L., Sergejeva, S., Sobolevskaja, R. 1986. The Cambrian-Ordovician boundary in the Baltic-Ladoga clint area (North Estonia and Leningrad Region, USSR). Proceedings of the Academy of Sciences of the Estonian SSR. Geology 35, 3, 97-108.
Gorjansky, V. J. 1969. Inarticulate brachiopods of the Cambrian and Ordovician of the northwest Russian Platform.