Cyclostomiceras Hyatt 1900

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 expa...

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Bibliographic Details
Main Authors: Kröger, Björn, Pohle, Alexander
Format: Other/Unknown Material
Language:unknown
Published: 2021
Subjects:
Biodiversity
Taxonomy
Animalia
Mollusca
Cephalopoda
Tetrabranchia
Cyclostomiceratidae
Cyclostomiceras
Hyatt
Ny Friesland
Spitsbergen
Online Access:https://zenodo.org/record/5793450
https://doi.org/10.5281/zenodo.5793450
Description
Summary: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). Published as part of Kröger, Björn & Pohle, Alexander, 2021, Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities, pp. 1-102 in European Journal of Taxonomy 783 (1) on page 15, DOI:10.5852/ejt.2021.783.1601, http://zenodo.org/record/5793422

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