Orthocerida Kuhn, 1940

Taxon description

Kröger & Isakar, 2006

Emended diagnosis. Straight or curved with smooth orelaborately ornamented shells, with central or subcentral nar-row siphuncle siphuncle that may be slightly expanded be-tween the chambers. Siphuncular necks achoanitic, subortho-choanitic or orthochoanitic. Apex spherical, bowl-shaped orblunt, invariably without cicatrix

Selection of related publications
Kröger, B. & Aubrechtová, M. 2018. Cephalopods from reef limestone of the Vasalemma Formation, northern Estonia (latest Sandbian, Upper Ordovician) and the establishment of a local warm-water fauna. Journal of Systematic Palaeontology 16, 10, 799-839. DOI:10.1080/14772019.2017.1347212
Kröger, B. 2013. The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden. European Journal of Taxonomy 41, 1-110. DOI:10.5852/ejt.2013.41
Kröger, B., Ebbestad, J. O., Högström, A. E. S. & Frisk, A. M. 2011. Mass concentration of Hirnantian cephalopods from the Siljan District, Sweden; palaeoecology and palaeobiogeographic relationships. Fossil Record 14, 1, 35-53. DOI:10.1002/mmng.201000014
Kröger, B. 2007. Concentrations of juvenile and small adult cephalopods in the Hirnantian cherts (Late Ordovician) of Porkuni, Estonia. Acta Palaeontologica Polonica 52, 3, 591-608.
Kröger, B. & Isakar, M. 2006. Revision of annulated orthoceridan cephalopods of the Baltoscandic Ordovician. Fossil Record 9, 1, 137-163. DOI:10.1002/mmng.200600005
Kröger, B. 2004. Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia. Acta Palaeontologica Polonica 49, 1, 57-74.
Mutvei, H. 2002. Connecting ring structure and its significance for classification of the orthoceratid cephalopods. Acta Palaeontologica Polonica 47, 1, 157-168.
King, A. H. 1999. A Review of Volkhovian and Kundan (Arenig-Llanvirn) Nautiloids from Sweden. Advancing Research on Living and Fossil Cephalopods. Olóriz F. & Rodríguez-Tovar F. J. (Eds.) , pp. 137-159. DOI:10.1007/978-1-4615-4837-9_11
Rõõmusoks, A. 1970. Stratigraphy of the Viruan Series (Middle Ordovician) in Northern Estonia, I.
Stumbur, H. A. 1956. On the nautiloids of Kohila Subseries (Upper Ordovician of East Baltic). Tartu Riikliku Ülikooli Toimetised 42, 176-185.
Balashov, Z. G. 1956. On the systematic position and stratigraphic meaning of the species Orthoceras. Yearbook of All-Union Paleontological Society XV, 223-247.
Balashov, Z. G. 1955. Genus Cochlioceratidae nom. nov.. Voprosy paleontologii , II, 55-60. Voprosy paleontologi, II, pp. 55-60.
Stumbur, H. 1955. Eesti NSV ülem-ordoviitsiumi nautiloididest. Diplomitöö; 16 fototahvlit, materjali nimekiri Stumburi tööde kaustas, pp. 1-159.
Alichova, T. N., Balashova, E. A. & Balashov, Z. G. 1954. Field atlas of characteristic Ordovician and Silurian faunas of southern Lithuania.
Teichert, C. 1930. Die Cephalopoden-Fauna der Lyckholm-Stufe des Ostbaltikums. Paläontologische Zeitschrift 12, 3/4, 264-312. DOI:10.1007/BF03044452
Öpik, A. 1927. Die Inseln Odensholm und Rogö. Ein Beitrag zur Geologia von NW Estland. Tartu Ülikooli Geoloogia Instituudi Toimetused 9, 70.
Eichwald, K. E. 1860. Lethaea Rossica ou Paléontologie de la Russie, décrite et figurée. 1, Seconde Section de l’ancienne Période.
Schlotheim, E. F. von 1820. Die Petrefactenkunde auf ihrem jetzingen Standpuncte durch die Beschreibung seiner Sammlung versteinerter und fossiler Überreste des Thier-und Pfanzenreichs der Vorwelt erläuteri.