Species

Striatocycloceras obliquum (Eichwald, 1857)

Taxon description

Kröger & Isakar, 2006

Diagnosis. Straight, slightly compressed Striatocycloceras with high apical angle of approximately 10°. Six, irregularly spaced smooth annulations at a distance that equates the corresponding shell diameter in adult, with three annulations in juvenile specimens, respectively. Annulations slightly oblique toward growth direction with slight lateral sinus, with approximately 10 growth lines per annulation. One suture line at every groove of the annulation, annulations slightly oblique to ward sutures.

Synonymy list

1857 Orth. obliquum — Eichwald , pp. 196

1860 Orthoceras obliquum — Eichwald , pp. 1209, fig. 49:7

1879 Orthoceras obliquum — Dewitz , pp. 34

1880 Orthoceras obliquum — Dewitz , pp. 170

1930 Orthoceras obliquum — Teichert , pp. 270, 278

2006 Striatocycloceras obliquum (Eichwald, 1860) — Kröger & Isakar , pp. 151, fig. 7K,O; 8D, 11

2013 Striatocycloceras obliquum — Kröger , pp. 25

Selection of related publications

Kröger, B., Isakar, M. 2006. Revision of annulated orthoceridan cephalopods of the Baltoscandic Ordovician. Fossil Record 9, 1, 137-163. DOI:10.1002/mmng.200600005

Eichwald, E. 1857. Beitrag zur geographischen Verbreitung der fossilen Thiere Russlands. Alte Periode. (Fortsetzung. S. Bulletin 1856. N 4. pag. 555.). Klasse der Cephalopoden. Bulletin of the Moscow Society of Naturalists. Geological series 30, I, 192-219.

Klassificering

Organism group	Biota
Kingdom	Animalia
Phylum	Mollusca
Class	Cephalopoda
Subclass	Orthoceratia
Order	Orthocerida
Suborder	Orthoceratina
Family	Orthoceratidae
Subfamily	Orthoceratinae
Genus	Striatocycloceras
Species	foerstei
	isbergi
	obliquum
	romingeri
	undulostriatum