Trocholitoceras Hyatt 1894

Genus Trocholitoceras Hyatt, 1894 Type species Trocholitoceras walcotti Hyatt, 1894, from the Fort Cassin Limestone (late Floian Stage), Fort Cassin, Addison County, Vermont, USA; by original designation. Diagnosis Moderately large, subdiscoidal, involute conchs with a ca 180° long body chamber; umb...

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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
Tarphycerida
Trocholitidae
Trocholitoceras
Hyatt
Ny Friesland
Spitsbergen
Online Access:https://zenodo.org/record/5793596
https://doi.org/10.5281/zenodo.5793596
Description
Summary:Genus Trocholitoceras Hyatt, 1894 Type species Trocholitoceras walcotti Hyatt, 1894, from the Fort Cassin Limestone (late Floian Stage), Fort Cassin, Addison County, Vermont, USA; by original designation. Diagnosis Moderately large, subdiscoidal, involute conchs with a ca 180° long body chamber; umbilical perforation very small; ornamented with prominent, partly fasciculate growth lines and low ribs which form a deep rounded ventral sinus; sutures directly transverse and nearly straight except on dorsal side where they form a shallow lobe; siphuncle small, subcentral during early adolescence, dorsal or nearly so at maturity (from Ulrich et al. 1942: 80). 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 69, DOI:10.5852/ejt.2021.783.1601, http://zenodo.org/record/5793422

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