Cephalopoda

Dawsonoceras fenestratum (Eichwald, 1860)

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
1860     Cycloceras fenestratum — Eichwald, pp. 1231, 1232, fig. 48:14a-b
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
References based on distribution