Genus

Cyrtorizoceras Hyatt, 1900

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. 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

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. Cyrtorizoceras borni Teichert, 1930 | Nabala Stage→Vormsi Stage

2. Cyrtorizoceras hariense Kröger, 2025 | Vormsi Stage

3. Cyrtorizoceras tenue Strand, 1934 | Ordovician

4. Cyrtorizoceras thorsundi Kröger, 2013 | Katian

Classification

Organism group	Biota
Kingdom	Animalia
Phylum	Mollusca
Class	Cephalopoda
Subclass	Multiceratoidea
Order	Oncocerida
Family	Oncoceratidae
Genus	Beloitoceras
	Cyrtorizoceras
Species	borni
	hariense
	minneapolis
	tenue
	thorsundi
Genus	Dalecarlioceras
	Neumatoceras
	Oncoceras
	Oocerina
	Paramiamoceras
	Retizitteloceras
	Richardsonoceras
	Richardsonoceroides
	Rizosceras