Taxon description
Kröger & Isakar, 2006
Diagnosis. Dawsonoceras with an apical angle of < 10° in juvenile stages. Tubular adult living chamber of approximately 25 mm in diameter. Five to six annulations at distance equal to shell diameter. Approximately, 20 longitudinal striae around the shell circumference, approximately fifteen growth lines or transverse striae per cycle of annulations. Septal necks achoanitic. Siphuncle subcentral, expanded within the chambers.
Type specimen data
PSM 1/1076 ,
Synonymy list
1858 Orthoceras calamiteum Portlock, 1843 — Schmidt , pp. 197
1859 Cycloceras fenestratum — Eichwald , fig. 48:14
1860 Cycloceras fenestratum m. — Eichwald , pp. 1231-1232
1880 Orthoceras funiforme — Angelin , pp. 2 , fig. 7:18-20
1889 Orthoceras funiforme — Rüdiger , pp. 59
1889 Cycloceras fenestratum — Rüdiger , pp. 59
1925 Orthoceras fenestratum Eichwald — Bekker
1962 Cedarvilleoceras porkunense — Balashov & Zhuravleva , fig. 13:9
1984 Cedarvilleoceras porkunense — Dzik , pp. 125 , fig. text fig. 49.21
1988 Calorthoceras (Hornyoceras) lineatum — Kiselev , pp. 81 , fig. text fig. 3
1989 Cedarvilleoceras fenestratum — Kiselev , pp. 65
1989 Cedarvilleoceras porkunense — Kiselev , pp. 65
1990 Cedarvilleoceras fenestratum — Kiselev , pp. 46, 62 , fig. 10:4
1990 Cedarvilleoceras porkunense — Kiselev , pp. 46, 62 , fig. 10:1
1991 Cedarvilleoceras fenestratum (Eichwald, 1861) — Kiselev , pp. 87 , fig. 2:2
2006 Dawsonoceras fenestratum (Eichwald) — Kröger & Isakar , pp. 156 , fig. 8B, 10B, 12C,F,G
2007 Dawsonoceras fenestratum (Eichwald, 1860) — Kröger , pp. 597
2013 Dawsonoceras fenestratum (Eichwald, 1860) — Kröger , pp. 30 , fig. 13A, 14B, 16A-B
Selection of related publications
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. 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., Isakar, M. 2006. Revision of annulated orthoceridan cephalopods of the Baltoscandic Ordovician. Fossil Record 9, 1, 137-163. DOI:10.1002/mmng.200600005
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Classification
Organism group | Biota |
Kingdom | Animalia |
Phylum | Mollusca |
Class | Cephalopoda |
Subclass | Orthoceratia |
Order | Orthocerida |
Suborder | Orthoceratina |
Family | Dawsonoceratidae |
Genus | Dawsonoceras |
Species | annulatum |
barrandei | |
fenestratum | |
funiforme | |
gregarium | |
obsoletum | |
stumburi |
See also
References based on distribution
- Kröger, 2013 Osmundsberget Quarry Katian
- Kröger, 2013 Kallholn quarry Katian
- Kröger & Isakar, 2006 Porkuni Porkuni Stage