Genus
Discoceras Barrande, 1867
Taxon description
Kröger & Aubrechtová, 2019
Diagnosis (after Furnish & Glenister 1964). Gradually expanding conchs with a ribbed or smooth shell surface, characterized by a slight to moderate whorl overlap, circular to subquadrate whorl cross section, central position of siphuncle in initial half-volution, marginodorsal in succeeding 1.5–2 whorls, subdorsal at maturity, and thick, layered connecting rings.
Aiheeseen liittyvät julkaisut
Aubrechtová, M., Korn, D., Kröger, B. 2026. The genus Discoceras (Tarphyceratida, Cephalopoda; Ordovician) from Estonia and glacial erratics in north-central Europe. Journal of Taphonomy 1-54. DOI:10.5852/ejt.2026.1036.3173
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, 1-169. DOI:10.5852/ejt.2025.978.2801
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
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, 41, 1-110. DOI:10.5852/ejt.2013.41
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
Sweet, W. C. 1988. The Conodonta: morphology, taxonomy, paleoecology, and evolutionary history of a long-extinct animal phylum. Oxford Monographs on Geology and Geophysics 10, 1-212.
Stumbur, H. A. 1960. On different ways of evolution of nautiloids. Eesti NSV Teaduste Akadeemia Toimetised, Tehniliste ja Füüsikalis-matemaatiliste teaduste seeria / Известия Академии наук Эстонской ССР. Серия технических и физико-математических наук 9, 4, 368-378. DOI:10.3176/phys.math.tech.1960.4.09
Sweet, W. C. 1958. The Middle Ordovician of the Oslo Region, Norway: 10. Nautiloid Cephalopods. Norsk Geologisk Tidsskrift 38, 1, 1-178.
Stumbur, H. A. 1956. On the nautiloids of Kohila Subseries (Upper Ordovician of East Baltic). Tartu Riikliku Ülikooli Toimetised 42, 176-185.
Stumbur, H. 1955. Eesti NSV ülem-ordoviitsiumi nautiloiididest [Diplomitöö. Juhendaja: A. Rõõmusoks]. pp. 1-159.
Balashov, Z. G. 1953. Svernutye i polusvernutye nautiloidei ordovika Pribaltiki. Trudy Vsesoûznogo Naučno-Issledovatel'skogo Geologo-Razvedočnogo Instituta (VNIGRI) 217-300. Gostoptehizdat.
Teichert, C. 1930. Die Cephalopoden-Fauna der Lyckholm-Stufe des Ostbaltikums. Paläontologische Zeitschrift 12, 3/4, 264-312. DOI:10.1007/BF03044452
Eichwald, E. 1861. Paleontologiâ Rossii. Drevnij period. II. Fauna grauvakkovoj, gornoizvestkovoj i medistoslancevatoj formacij Rossii. pp. 1-521. R. Golike (former Ya. Ionsona).
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. von 1840. Geognostičeskie zamečaniâ o Litve, Volyni i Podolii. Gorny Zhurnal 3, 7, 1-59.
List of species
1. Discoceras amtjaernense Kröger et Aubrechtová, 2019 | Sandbian
2. Discoceras angulatum (Saemann, 1853) | Pirgu Stage
3. Discoceras angustum Aubrechtová, Korn et Kröger, 2026 | Keila Stage
5. Discoceras arctuatum (Lossen, 1860) | Darriwilian
6. Discoceras aseriense Aubrechtová, Korn et Kröger, 2026 | Aseri Stage
7. Discoceras bandonis Remelé, 1890 | Idavere Substage
10. Discoceras costatum Rasmussen et Surlyk, 2012 | Katian
13. Discoceras depressum Sweet, 1958 | Darriwilian
14. Discoceras fleischeri Sweet, 1958 | Upper Ordovician
15. Discoceras gubkovense (Balashov, 1953) | Idavere Substage
16. Discoceras ievense (Balashov, 1953) | Jõhvi Substage
18. Discoceras paopense Kröger, 2025 | Katian
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Luokittelu
See also
Levinneisyys ja viitteet
- Kröger, 2013 Kärdla quarry Vormsi Stage
- Kröger, 2013 Kärdla quarry Vormsi Stage
- Kröger, 2013 Kallholn quarry Katian