Brachiopoda

Protorthida Schuchert et Cooper, 1931

Selection of related publications
Rubel, M. 2011. Silurian brachiopods Dictyonellida, Strophomenida, Productida, Orthotetida, Protorthida and Orthida from Estonia. Fossilia Baltica 4, pp. 1-133.
Egerquist, E., Holmer, L. E. 2006. Early-Middle Ordovician (Billingen- Volkhov stages) Orthide and Protorthide brachiopods from the East Baltic. GFF 128, 4, 339-348. DOI:10.1080/11035890601284339
Rubel, M. P. 1963. Silurian brachiopods Orthida of Estonia. Trudy Instituta geologii AN ESSR 13, 109-160. ENSV Teaduste Akadeemia Geoloogia Instituudi Uurimused XIII, pp. 109-160.