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
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).