Orthidae Woodward, 1852

Selection of related publications
Hints, L., Hints, O., Nemliher, R. & Nõlvak, J. 2007. Hulterstad brachiopods and associated faunas in the Vormsi Stage (Upper Ordovician, Katian) of the Lelle core, Central Estonia. Estonian Journal of Earth Sciences 56, 3, 131-142.
Tolmacheva, T., Egerquist, E., Meidla, T., Tinn, O. & Holmer, L. 2003. Faunal composition and dynamics in unconsolidated sediments: a case study from the Middle Ordovician of the East Baltic. Geological Magazine 140, 1, 31-44. DOI:10.1017/S001675680200701X
Jaanusson, V. & Bassett, M. G. 1993. Orthambonites and related Ordovician brachiopod genera. Palaeontology 36, 1, 21-63.
Rubel, M. P. 1962. New species of brachiopods (Dalmanellidae) from the Llandoverian of Estonia. Trudy Instituta geologii AN ESSR 10, 173-186. ENSV Teaduste Akadeemia Geoloogia Instituudi Uurimused X, pp. 173-186.
Rubel, M. P. 1961. Lower-Ordovician brachiopods of the superfamilies Orthacea, Dalmanellacea and Syntrophiacea of Eastern Baltic. Trudy Instituta geologii AN ESSR 6, 141-226. ENSV Teaduste Akadeemia Geoloogia Instituudi Uurimused VI, pp. 141-226.
Oraspõld, A. L. 1959. Some representatives of the Superfamily Orthacea from the Upper Ordovician of Estonia. Tartu Riikliku Ülikooli Toimetised 75, I, 59-79. Töid Eesti NSV geoloogia alalt, I, pp. 59-79.
Öpik, A. 1939. Brachiopoden und Ostrakoden aus dem Expansusschiefer Norwegens. Norsk Geologisk Tidsskrift 19, 117-142.
Öpik, A. 1934. Über Klitamboniten. Acta Univ. Tartu A XXVI,
Öpik, A. 1930. Brachiopoda Protremata der estländischen ordovizischen Kukruse-Stufe. Tartu Ülikooli Geoloogia Instituudi Toimetused 20, 1-261.
Öpik, A. 1927. Beiträge zur Kenntnis der Kukruse-(C2-)Stufe in Eesti. II. Tartu Ülikooli Geoloogia Instituudi Toimetused 10, 1-35.
Bekker, H. 1921. The Kuckers Stage of the Ordovician Rocks in NE Estonia. Acta Univ. Tartu A II, 1, 1-90.