liik

Dawsonoceras fenestratum (Eichwald, 1860)

Taksoni kirjeldused

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.

Sünonüümika
1858     Orthoceras calamiteum Portlock, 1843 — Schmidt , lk. 197
1859     Cycloceras fenestratum — Eichwald , joon. 48:14
1860     Cycloceras fenestratum m. — Eichwald , lk. 1231-1232
1880     Orthoceras funiforme — Angelin , lk. 2, joon. 7:18-20
1889     Orthoceras funiforme — Rüdiger , lk. 59
1889     Cycloceras fenestratum — Rüdiger , lk. 59
1925     Orthoceras fenestratum Eichwald — Bekker
1962     Cedarvilleoceras porkunense — Balashov & Zhuravleva , joon. 13:9
1984     Cedarvilleoceras porkunense — Dzik , lk. 125, joon. text fig. 49.21
1988     Calorthoceras (Hornyoceras) lineatum — Kiselev , lk. 81, joon. text fig. 3
Valik taksonit käsitlevast teaduskirjandusest
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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Klassifikatsioon
Levik kirjandusandmetel