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...
| Main Authors: | , |
|---|---|
| Format: | Text |
| Language: | unknown |
| Published: |
Zenodo
2021
|
| Subjects: | |
| Online Access: | https://dx.doi.org/10.5281/zenodo.5793596 https://zenodo.org/record/5793596 |
| 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 : {"references": ["Hyatt A. 1894. Phylogeny of an acquired characteristic. Proceedings of the American Philosophical Society 32: 349 - 647. https: // doi. org / 10.5962 / bhl. title. 59826", "Ulrich E. O., Foerste A. F., Miller A. K. & Furnish W. M. 1942. Ozarkian and Canadian cephalopods: Part I: Nautilicones. Geological Society of America Special Papers 37: 1 - 157. https: // doi. org / 10.1130 / SPE 37 - p 1"]} |
|---|