Brachiopoda

Helmersenia Pander, 1860

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.
Puura, I. 1996. Lingulate brachiopods and biostratigraphy of the Cambrian-Ordovician boundary beds in Baltoscandia. Doctoral Thesis, pp. 1-214.
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.
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.
Goryansky, V. J. 1969. Inarticulate brachiopods of the Cambrian and Ordovician of the northwest Russian Platform.
References based on distribution