Genus

Isorthoceras 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, 1-169. 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

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.

List of species

1. Isorthoceras angelini Kröger, 2013 | Katian

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

3. Isorthoceras curvilineatum Kröger, 2013 | Katian

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

5. Isorthoceras elongatocinctum (Portlock, 1843) | Katian

6. Isorthoceras heroyense (Strand, 1934) | Katian

7. Isorthoceras junceum (Hall, 1847) | Hirnantian

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

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

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

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

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

13. Isorthoceras suave (Angelin, 1880) | Katian

14. Isorthoceras sylphide Kröger et Aubrechtová, 2019 | Sandbian→Katian

15. Isorthoceras urdr Kröger et Aubrechtová, 2019 | Sandbian→Katian

16. Isorthoceras vexilli Kröger et Aubrechtová, 2018 | Keila Stage

17. Isorthoceras wahlenbergi Niko, 2008 | Katian

Classification

Organism group	Biota
Kingdom	Animalia
Phylum	Mollusca
Class	Cephalopoda
Subclass	Orthoceratia
Order	Orthocerida
Suborder	Orthoceratina
Family	Proteoceratidae
Genus	Clothoceras
	Ephippiorthoceras
	Gorbyoceras
	Isorthoceras
Species	angelini
	bisignatum
	cavi
	curvilineatum
	dalecarlense
	elongatocinctum
	heroyense
	junceum
	luhai
	maris
	nikwis
	padisense
	saaremense
	sociale
	suave
	sylphide
	urdr
	vexilli
	wahlenbergi
Genus	Transorthoceras