Subclass

Orthoceratia Teichert, 1967

Selection of related publications

Kröger, B. 2025. The Lyckholm acme of cephalopods – Review of the late Katian (Vormsi–Pirgu regional stages) Ordovician cephalopods of Estonia. European Journal of Taxonomy 978, 1-168. DOI:10.5852/ejt.2025.978.2801

Vinn, O., Holmer, L. E., Wilson, M. A., Isakar, M., Toom, U. 2023. A Rowellella (Lingulata, Brachiopoda) nestler in a Trypanites boring from the Middle Ordovician of Estonia: An early colonizer of hard substrate borings. Palaios 38, 5, 240-245. DOI:10.2110/palo.2023.003

Aubrechtová, M., Korn, D. 2022. Taxonomy and ontogeny of the Lituitida (Cephalopoda) from Orthoceratite Limestone erratics (Middle Ordovician). European Journal of Taxonomy 799, 1-108. DOI:10.5852/ejt.2022.799.1681

Aubrechtová, M., Meidla, T. 2020. Lituitid cephalopods from the upper Darriwilian and basal Sandbian (Middle–Upper Ordovician) of Estonia. GFF 142, 4, 267-296. DOI:10.1080/11035897.2020.1762723

Kröger, B., Aubrechtová, M. 2019. The cephalopods of the Kullsberg Limestone Formation, Upper Ordovician, central Sweden and the effects of reef diversification on cephalopod diversity. Journal of Systematic Palaeontology 17, 12, 961-995. DOI:10.1080/14772019.2018.1491899

Pohle, A., Klug, C., Toom, U., Kröger, B. 2019. Conch structures, soft-tissue imprints and taphonomy of the Middle Ordovician cephalopod Tragoceras falcatum from Estonia. Fossil Imprint 75, 1, 70-78. DOI:10.2478/if-2019-0006

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

Aubrechtová, M., Meidla, T. 2016. The oldest ascocerid cephalopod from the Silurian of Estonia and notes on the biogeography of the order Ascocerida (class Cephalopoda). Estonian Journal of Earth Sciences 65, 2, 98-104. DOI:10.3176/earth.2016.07

Manda, Š., Turek, V. 2015. Colour patterns on Silurian orthocerid and pseudorthocerid Conchs from Gotland - palaeoecological implications. Estonian Journal of Earth Sciences 64, 1, 74-79. DOI:10.3176/earth.2015.13

Aubrechtová, M. 2015. A revision of the Ordovician cephalopod Bactrites sandbergeri Barrande: Systematic position and palaeobiogeography of Bactroceras. Geobios 48, 3, 193-211. DOI:10.1016/j.geobios.2015.03.002

Kröger, B. 2013. The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden. European Journal of Taxonomy 41, 41, 1-110. DOI:10.5852/ejt.2013.41

Kröger, B. 2012. The “Vaginaten”: the dominant cephalopods of the Baltoscandian Mid Ordovician endocerid limestone. GFF 134, 2, 115-132. DOI:10.1080/11035897.2012.691897

Kröger, B., Ebbestad, J. O. R., Högström, A. E. S., Frisk, Ǻ. M. 2011. Mass concentration of Hirnantian cephalopods from the Siljan District, Sweden; taxonomy, 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, pp. 137-159. Springer. DOI:10.1007/978-1-4615-4837-9_11

Mutvei, H. 1997. Siphuncular structure in Ordovician endocerid cephalopods. Acta Palaeontologica Polonica 42, 3, 375-390.

Kiselev, G. N. 1991. Revizia pozdneordovikskikh i siluriskikh tsefalopod Pribaltiki iz kollektsii E. I. Eichwalda [Ревизия позднеордовикских и силурийских цефалопод прибалтики из коллекции Е. И. Эйхвальда]. Bulletin of the Moscow Society of Naturalists. Geological series 66, 4, 85-101.

Rõõmusoks, A. 1970. Stratigraphy of the Viruan Series (Middle Ordovician) in Northern Estonia, I. pp. 1-346. Valgus.

Balashov, Z. G. 1968. Èndoceratoidei ordovika SSSR [Эндоцератоидеи ордовика СССР]. pp. 1-277. Izdatel'stvo Leningradskogo Universiteta.

Saladžius, V. J. 1966. Mollusk fauna of the Silurian deposits of the south of the East Baltic territory. Palaeontology and stratigraphy of the Baltic and the Byelorussia. Number I (VI), pp. 31-73. Mintis.

Balashov, Z. G. 1964. O stroenii i okraske stenki rakoviny nekotoryh ordovikskih endoceratoidej Pribaltiki. Voprosy paleontologii IV, 106-110.

Balashov, E. A. 1959. Nekotorye novye vidy nautiloidej ordovika, silura i devona SSSR. Materialy k "Osnovam paleontologii", Bypusk 3, pp. 37-46. Paleontologicheskii Institut Akademii Nauk SSSR.

Sweet, W. C. 1958. The Middle Ordovician of the Oslo Region, Norway: 10. Nautiloid Cephalopods. Norsk Geologisk Tidsskrift 38, 1, 1-178.

Balashov, Z. G. 1956. O sistematicheskom polozhenii i stratigraficheskom znachenii roda Orthoceras. Ežegodnik Vsesoûznogo Paleontologičeskogo Obŝestva XV, 223-247.

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. 1955. Semejstvo Cochlioceratidae nom. nov.. Voprosy paleontologii II, 55-60.

Stumbur, H. 1955. Eesti NSV ülem-ordoviitsiumi nautiloiididest [Diplomitöö. Juhendaja: A. Rõõmusoks]. pp. 1-159.

Alichova, T. N., Balashova, E. A., Balashov, Z. G. 1954. Polevoj atlas harakternyh kompleksov fauny otloženij ordovika i gotlandiâ ûžnoj časti Litovskoj SSR. pp. 1-80. Nedra.

Balashov, Z. G. 1953. Svernutye i polusvernutye nautiloidei ordovika Pribaltiki. Trudy Vsesoûznogo Naučno-Issledovatel'skogo Geologo-Razvedočnogo Instituta (VNIGRI) 217-300. Gostoptehizdat.

Strand, T. 1934. The Upper Ordovician Cephalopods of the Oslo Area. Norsk Geologisk Tidsskrift 14, 1-117.

Foerste, A. F. 1932. The cephalopod genera Cyrtendoceras and Oelandoceras. The Ohio Journal of Science 32, 3, 163-172.

Teichert, C. 1930. Der erste europäische Vertreter der Gattung Ischyrinia Billings (Eucrust. Nodostr.) in der Lyckholm-Stufe von Estland. Paläontologische Zeitschrift 12, 2, 130-134. DOI:10.1007/BF03044505

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, 1-69.

Holm, G. 1892. Om tvenne Gyroceras-formigt böjda Endoceras-arter. GFF 14, 2, 125-136. DOI:10.1080/11035899209444299

Holm, G. 1891. Om mynningen hos Lituites Breyn. Geologiska Föreningens i Stockholm Förhandlingar 13, 7, 736-780. DOI:10.1080/11035899109445850

Foord, A. H. 1887. On “Orthoceras (Endoceras) duplex” Wahlenberg et auct., with descriptions of three new species of Endoceras from the Ordovician of Sweden and Russia contained in the British Museum (Natural History). Annals and Magazine of Natural History 5, 20, 393–403.

Kjerulf, T. 1865. Veiviser ved geologiske excursioner i Christiania Omegn med et Farvetrykt Kart or Flere Traensit. Universitätsprogram for andet Halvaar 1865. pp. . Brøgger & Christie's Bogtrykkeri.

Eichwald, E. 1860. Lethaea Rossica ou Paléontologie de la Russie. Premier volume. Ancienne Période en deux sections. pp. XIX+1–1657. E. Schweizerbart. DOI:10.5962/bhl.title.52391

Eichwald, E. 1857. Beitrag zur geographischen Verbreitung der fossilen Thiere Russlands. Alte Periode. (Fortsetzung. S. Bulletin 1856. N 4. pag. 555.). Klasse der Cephalopoden. Bulletin of the Moscow Society of Naturalists. Geological series 30, I, 192-219.

Eichwald, E. 1840. Die Thier- und Pflanzenreste des Alten Rothen Sandsteins und Bergkalks im Novgorod'schen Gouvernment. Bull. Sci. Acad. Imp. Sci. Saint-Petersbourg 7, 6, 7, 78-91.

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. pp. Ixii+1-436. Becker'sche Buchhandlung.

List of species

1. Allumettoceras mjoesense Sweet, 1958 | Darriwilian

2. Ancistroceras barrandei Dewitz, 1880 | Aseri Stage→Uhaku Stage

3. Ancistroceras ristnensis Aubrechtová et Meidla, 2020 | Darriwilian

4. Ancistroceras torelli (Remelé, 1881) | Uhaku Stage

5. Ancistroceras undulatum (Boll, 1857) | Uhaku Stage

6. Ancistroceras vahikuelaensis Aubrechtová et Meidla, 2020 | Lasnamägi Stage→Uhaku Stage

7. Angelinoceras latum (Angelin, 1880) | Aseri Stage

8. Anthoceras vaginatum (Schlotheim, 1820) | Kunda Stage

9. Archigeisonoceras elegatulum Chen, 1984

10. Archigeisonoceras folkeslundense Kröger, 2004 | Lasnamägi Stage

11. Archigeisonoceras picus Kröger, 2004 | Volkhov Stage

12. Archigeisonoceras repplingense Kröger, 2004 | Volkhov Stage

13. Arionoceras lotskirkense Kröger, 2004 | Aseri Stage→Lasnamägi Stage

14. Bactroceras angustisiphonatum (Rüdiger, 1889) | Lasnamägi Stage

15. Bactroceras avus Holm, 1898 | Darriwilian

16. Bactroceras sandbergeri Barrande, 1867 | Darriwilian

17. Balticoceras discors (Eichwald, 1857) | Rakvere Stage

18. Bodoceras torticoni Frye, 1982 | Upper Ordovician

19. Cameroceras aluverense Balashov, 1968 | Jõhvi Substage

20. Cameroceras hasta (Eichwald, 1857) | Vormsi Stage

Classification

Organism group	Biota
Kingdom	Animalia
Phylum	Mollusca
Class	Cephalopoda
Subclass	Actinoceratoidea
	Ammonoidea
	Bactritoidea
	Coleoidea
	Endoceratoidea
	Multiceratoidea
	Nautilia
	Orthoceratia
Order	Astroviida
	Bajkalocerida
	Dissidoceratida
	Endoceratida
	Orthocerida
	Pseudorthocerida
	Rioceratida
Subclass	Tarphyceratia
Order	Bactritida
	Barrandeocerida
	Basslerocerida
Superfamily	Tainoceratoidea
Genus	Botellusoceras
	Phylloceras