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

Klassifikatsioon

organismirühm	Biota
riik	Animalia
hõimkond	Mollusca
klass	Cephalopoda
alamklass	Orthoceratia
selts	Orthocerida
alamselts	Orthoceratina
sugukond	Dawsonoceratidae
perekond	Dawsonoceras
liik	annulatum
	barrandei
	fenestratum
	funiforme
	gregarium
	obsoletum
	stumburi