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.
Selection of related publications
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.
Sweet, W. C. 1958. The Middle Ordovician of the Oslo Region, Norway: 10. Nautiloid Cephalopods. Norsk Geologisk Tidsskrift 38, 1, 1-176.
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. 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, 1854) | Pirgu Stage
4. Discoceras arctuatum (Lossen, 1860) | Darriwilian
5. Discoceras bandonis Remelé, 1880 | Idavere Substage
8. Discoceras depressum Sweet, 1958 | Darriwilian
9. Discoceras fleischeri Sweet, 1958 | Upper Ordovician
10. Discoceras gubkovense (Balashov, 1953) | Idavere Substage
11. Discoceras ievense (Balashov, 1953) | Jõhvi Substage
15. Discoceras siljanense Kröger, Ebbestad, Högström et Frisk, 2011 | Hirnantian
16. Discoceras spongistriatum (Balashov, 1953) | Upper Ordovician
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Classification
Organism group | Biota |
Kingdom | Animalia |
Phylum | Mollusca |
Class | Cephalopoda |
Subclass | Tarphyceratia |
Order | Tarphyceratida |
Family | Discoceratidae |
Genus | Curtoceras |
Discoceras | |
Species | amtjaernense |
angulatum | |
antiquissimum | |
arctuatum | |
bandonis | |
boreale | |
costatum | |
depressum | |
fleischeri | |
gubkovense | |
ievense | |
nilssoni | |
rarospira | |
roemeri | |
siljanense | |
spongistriatum | |
vasalemmense | |
Genus | Schroederoceras |
See also
References based on distribution
- Kröger, 2013 Kärdla quarry Vormsi Stage
- Kröger, 2013 Kärdla quarry Vormsi Stage
- Kröger, 2013 Kallholn quarry Katian
- Kröger, 2013 Kallholn quarry Katian
- Kröger, 2013 Skålberget Quarry Katian
- Kröger, 2013 Amtjärn Quarry Katian
- Stumbur, H., 1956 Haapsalu Pirgu Stage
- Kröger et al., 2011a Osmundsberget Quarry Hirnantian
- Teichert, 1930c Saare Manor (Lyckholm) old quarry
- Balashov, 1953a Rakvere
- Balashov, 1953a Aluvere quarry Jõhvi Substage
- Balashov, 1953a Pääsküla Jõhvi Substage
- Eichwald, 1861a Haljala
- Balashov, 1953a Rakvere Rakvere Stage
- Balashov, 1953a Plyussa River outcrop, Leningrad Oblast Rakvere Stage
- Balashov, 1953a Piirsalu old quarry Pirgu Stage
- Balashov, 1953a Vormsi Island Pirgu Stage
- Balashov, 1953a Rannaküla old quarry Pirgu Stage
- Eichwald, 1861a
- Eichwald, 1861a Osmussaar 1
- Kröger & Aubrechtová, 2018 Kärdla Nabala Stage
- Sweet, 1958 Helgøya Lasnamägi Stage
- Sweet, 1988 Asker, Oslo Region, Norway Lasnamägi Stage
- Sweet, 1958 Kjørholt quarry
- Sweet, 1958 Bygdøy Peninsula, Oslo
- Sweet, 1958 Asker, Oslo Region, Norway Lasnamägi Stage
- Eichwald, 1840c Osmussaar
- Kröger & Aubrechtová, 2019 Amtjärn Quarry Sandbian
- Kröger & Aubrechtová, 2019 Furodal Sandbian
- Eichwald, 1860a Kärdla