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...
Main Authors: | , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
Zenodo
2021
|
Subjects: | |
Online Access: | https://dx.doi.org/10.5281/zenodo.5793449 https://zenodo.org/record/5793449 |
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 : {"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."]} |
---|