Order
Actinocerida Teichert, 1933
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
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
Mutvei, H. 1998. Siphuncular structure in a Silurian narthecoceratid nautiloid cephalopod from the Island of Gotland. GFF 120, 4, 375-378. DOI:10.1080/11035899801204375
Kiselev, G. N., Sinicyna, I. N., Isakar, M. A., Mironova, M. G., Saladzhius, V. Y. 1990. Atlas mollûskov verhnego ordovika i silura severo-zapada Vostočno-Evropejskoj platformy. pp. 1-80. Leningrad University.
Saladžius, V. J. 1971. Cephalopods of the Ludlowian and Downtonian deposits of the Upper Silurian of the Southern Baltic area. Palaeontology and stratigraphy of the Baltic and Byelorussia. Number III, pp. 205-208. Mintis.
Balashov, Z. G. 1971. O sistematičeskom položenii i stratigrafičeskom značenii roda Eushantungoceras (nadotrâd Actinoceratoidea). Voprosy paleontologii VI, 61-65. Izdatel'stvo Leningradskogo Universiteta.
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. 1955. Nekotorye novye rody i vidy nautiloidej ordovika Pribaltiki. Voprosy paleontologii II, 45-54.
Stumbur, H. 1955. Eesti NSV ülem-ordoviitsiumi nautiloiididest [Diplomitöö. Juhendaja: A. Rõõmusoks]. pp. 1-159.
Teichert, C. 1930. Die Cephalopoden-Fauna der Lyckholm-Stufe des Ostbaltikums. Paläontologische Zeitschrift 12, 3/4, 264-312. DOI:10.1007/BF03044452
List of species
1. Actinoceras insulaenigrae Strand, 1934 | Ordovician
2. Adamsoceras holmi (Troedsson, 1926) | Kunda Stage
3. Aluveroceras ievense Balashov, 1955 | Jõhvi Substage
4. Armenoceras holtedahli Strand, 1934 | Ordovician
6. Eushantungoceras uralicum Balashov, 1971 | upper Silurian
7. Gorbormoceras vohilaidense Kröger, 2025 | Pirgu Stage
8. Hoeloceras askeri Sweet, 1958 | Sandbian
10. Hoeloceras muroni Kröger et Aubrechtová, 2018 | Keila Stage
11. Nybyoceras balticum (Troedsson, 1926) | Pirgu Stage
12. Nybyoceras bekkeri Troedsson, 1926 | Pirgu Stage
13. Nybyoceras holmi Sweet, 1958 | Darriwilian
14. Nybyoceras intermedium Teichert, 1930 | Pirgu Stage
15. Nybyoceras troedssoni Strand, 1934 | Ordovician
17. Ormoceras estonicum Balashov, 1955 | Lasnamägi Stage
18. Ormoceras heckeri Teichert, 1930 | Pirgu Stage
19. Ormoceras kiaeri Sweet, 1958 | Katian
20. Ormoceras lapense Saladzhius, 1966 | Ludlow
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Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Mollusca |
| Class | Cephalopoda |
| Subclass | Actinoceratoidea |
| Order | Actinocerida |
| Family | Actinoceratidae |
| Armenoceratidae | |
| Gonioceratidae | |
| Huroniidae | |
| Ormoceratidae | |
| Species | Sactoceras |
See also