Family

Proteoceratidae Flower, 1962

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. 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

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.

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

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. Clothoceras thornquisti Kröger et Aubrechtová, 2019 | Katian→Sandbian

2. Ephippiorthoceras frognoyense Strand, 1934 | Upper Ordovician

3. Ephippiorthoceras plicatuloides Strand, 1934 | Ordovician

4. Ephippiorthoceras vormsiense Kröger, 2025 | Pirgu Stage

5. Gorbyoceras alternestriatum (Strand, 1934) | Katian

6. Gorbyoceras clathratoannulatum (Roemer, 1861) | Nabala Stage→Vormsi Stage

7. Gorbyoceras stumburi (Kröger, 2013) | Vormsi Stage→Pirgu Stage

8. Gorbyoceras textumaraneum (Roemer, 1861) | Rakvere Stage→Pirgu Stage

9. Isorthoceras angelini Kröger, 2013 | Katian

10. Isorthoceras cavi Kröger et Aubrechtová, 2018 | Keila Stage

11. Isorthoceras curvilineatum Kröger, 2013 | Katian

12. Isorthoceras dalecarlense Kröger, Ebbestad, Högström et Frisk, 2011 | Hirnantian

13. Isorthoceras elongatocinctum (Portlock, 1843) | Katian

14. Isorthoceras heroyense (Strand, 1934) | Katian

15. Isorthoceras junceum (Hall, 1847) | Hirnantian

16. Isorthoceras luhai (Stumbur, 1956) | Upper Ordovician

17. Isorthoceras maris Kröger et Aubrechtová, 2018 | Keila Stage

18. Isorthoceras nikwis Kröger et Aubrechtová, 2019 | Sandbian→Katian

19. Isorthoceras padisense Kröger et Aubrechtová, 2018 | Keila Stage

20. Isorthoceras saaremense (Balashov, 1959) | Vormsi Stage→Pirgu Stage

Classification

Organism group	Biota
Kingdom	Animalia
Phylum	Mollusca
Class	Cephalopoda
Subclass	Orthoceratia
Order	Orthocerida
Suborder	Orthoceratina
Family	Arionoceratida
	Arionoceratidae
	Dawsonoceratidae
	Eriditidae
	Geisonoceratidae
	Lamellorthoceratidae
	Orthoceratidae
	Proteoceratidae
Genus	Clothoceras
	Ephippiorthoceras
	Gorbyoceras
	Isorthoceras
	Transorthoceras
Family	Tripteroceratidae