Cyclostomiceras Hyatt, 1900

Kröger, Björn & Pohle, Alexander, 2021, Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities, European Journal of Taxonomy 783 (1), pp. 1-102 : 15

publication ID	https://doi.org/10.5852/ejt.2021.783.1601
publication LSID	lsid:zoobank.org:pub:071EAD63-05ED-4D6C-AC45-8719E6D79E0B
DOI	https://doi.org/10.5281/zenodo.5793450
persistent identifier	https://treatment.plazi.org/id/5F4487AC-FFA2-FFA0-FD93-7E5FFB2678B5
treatment provided by	Felipe (2021-12-20 14:11:22, last updated 2024-11-26 01:11:36)
scientific name	Cyclostomiceras Hyatt, 1900
status

Treatment

Genus Cyclostomiceras Hyatt, 1900

Type species

Gomphoceras cassinense Whitfield, 1886 from the Fort Cassin Formation (Floian) at Fort Cassin headland, Vermont, USA; by original designation.

Diagnosis

Gomphoceroid, breviconic orthocones with circular to depressed conch cross section; phragmocone expanding adorally rapidly; anterior half of mature body chamber slightly contracted. Sutures and growth lines straight and directly transverse; siphuncle small, rSD = 0.15, ventral in position but not marginal; septal necks orthochoanitic, connecting rings thick and layered (from King 1998).

References

King A. H. 1998. A review of the cyclostomiceratid nautiloids, including new taxa from the Lower Ordovician of Oland, Sweden. Palaeontology 41: 335 - 347.