Genus

Orthoceras Bruguière, 1789

Selection of related publications

Pohle, A., Klug, C., Toom, U., Kröger, B. 2019. Conch structures, soft-tissue imprints and taphonomy of the Middle Ordovician cephalopod Tragoceras falcatum from Estonia. Fossil Imprint 75, 1, 70-78. DOI:10.2478/if-2019-0006

Kröger, B. 2004. Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia. Acta Palaeontologica Polonica 49, 1, 57-74.

Mutvei, H. 2002. Connecting ring structure and its significance for classification of the orthoceratid cephalopods. Acta Palaeontologica Polonica 47, 1, 157-168.

Rõõmusoks, A. 1970. Stratigraphy of the Viruan Series (Middle Ordovician) in Northern Estonia, I. pp. 1-346. Valgus.

Balashov, Z. G. 1956. O sistematicheskom polozhenii i stratigraficheskom znachenii roda Orthoceras. Ežegodnik Vsesoûznogo Paleontologičeskogo Obŝestva XV, 223-247.

Stumbur, H. A. 1956. On the nautiloids of Kohila Subseries (Upper Ordovician of East Baltic). Tartu Riikliku Ülikooli Toimetised 42, 176-185.

Stumbur, H. 1955. Eesti NSV ülem-ordoviitsiumi nautiloiididest [Diplomitöö]. pp. 1-159.

Alichova, T. N., Balashova, E. A., Balashov, Z. G. 1954. Polevoj atlas harakternyh kompleksov fauny otloženij ordovika i gotlandiâ ûžnoj časti Litovskoj SSR. pp. 1-80. Nedra.

Foord, A. H. 1887. On “Orthoceras (Endoceras) duplex” Wahlenberg et auct., with descriptions of three new species of Endoceras from the Ordovician of Sweden and Russia contained in the British Museum (Natural History). Annals and Magazine of Natural History 5, 20, 393–403.

Schlotheim, E. F. von 1820. Die Petrefactenkunde auf ihrem jetzingen Standpuncte durch die Beschreibung seiner Sammlung versteinerter und fossiler Überreste des Thier-und Pfanzenreichs der Vorwelt erläuteri. pp. Ixii+1-436. Becker'sche Buchhandlung.

List of species

1. Orthoceras arcuolyratum Schmidt, 1858 | Vormsi Stage

2. Orthoceras bifoveatum Noetling, 1884 | Lasnamägi Stage→Uhaku Stage

3. Orthoceras calamiteum Münster, 1839

4. Orthoceras luhai Stumbur, 1956 | Vormsi Stage

5. Orthoceras regulare Schlotheim, 1820 | Lasnamägi Stage→Uhaku Stage

6. Orthoceras revalense Foord, 1887

7. Orthoceras scabridum Angelin, 1880 | Aseri Stage→Lasnamägi Stage

Klassificering

Organism group	Biota
Kingdom	Animalia
Phylum	Mollusca
Class	Cephalopoda
Subclass	Orthoceratia
Order	Orthocerida
Suborder	Orthoceratina
Family	Orthoceratidae
Subfamily	Orthoceratinae
Genus	Ctenoceras
	Orthoceras
Species	arcuolyratum
	bifoveatum
	calamiteum
	compressum
	excentricum
	hoernesi
	luhai
	regulare
	revalense
	scabridum
Genus	Orthocycloceras
	Striatocycloceras