Species

Ctenoceras schmidti Noetling, 1884

Taxon description

Kröger & Isakar, 2006

Diagnosis. Ctenoceras with irregularly spaced annulations, with two to four annulations at a length equal to the diameter of the conch. Two or three ridges of the annulations occur between two subsequent suture lines. Apical angle between 2 and 7°. Adult dorsoventral shell diameter about 17 mm.

Synonymy list

1877 Orthoceras verticillatum v. Hagenow — Krause , pp. 24-25

1880 Cycloceras hisingeri Boll — Schröder , pp. 62

1884 Ctenoceras schmidti sp. nov. — Noetling , pp. 116-122, fig. 16:7,8; 18:3-5a

1931 Ctenoceras schmidti Noetling — Troedsson , pp. 16

1962 Ctenoceras schmidti Noetling — Balashov & Zhuravleva , fig. 11:8

1964 Ctenoceras schmidti Noetling — Sweet , pp. 255, fig. 155:1a-c

1971 Ctenoceras schmidti Noetling — Neben & Krüger , pp. 17, fig. 14-15

1973 Ctenoceras schmidti Noetling — Neben & Krüger , pp. 81, fig. 14-17

1984 Ctenoceras schmidti Noetling — Dzik , pp. 97, 105, fig. 39, 66

2004 Ctenoceras schmidti Noetling, 1884 — Kröger , pp. 63, fig. 11A

Selection of related publications

Kröger, B. 2007. Concentrations of juvenile and small adult cephalopods in the Hirnantian cherts (Late Ordovician) of Porkuni, Estonia. Acta Palaeontologica Polonica 52, 3, 591–608.

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

Classification

Organism group	Biota
Kingdom	Animalia
Phylum	Mollusca
Class	Cephalopoda
Subclass	Orthoceratia
Order	Orthocerida
Suborder	Orthoceratina
Family	Orthoceratidae
Subfamily	Orthoceratinae
Genus	Ctenoceras
Species	schmidti
	sweeti