Glabrocingulum Thomas 1940 ...
Genus Glabrocingulum Thomas, 1940 Type species. Glabrocingulum beggi Thomas, 1940; Carboniferous, Scotland. Diagnosis. Low- to moderately high-spired and turbiniform shell shape. The upper whorl surface forming an angle of <45 Ǫ with the selenizone located on the upper edge of whorl face. Sutures...
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| Format: | Text |
| Language: | unknown |
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Zenodo
2016
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| Online Access: | https://dx.doi.org/10.5281/zenodo.10903533 https://zenodo.org/doi/10.5281/zenodo.10903533 |
| Summary: | Genus Glabrocingulum Thomas, 1940 Type species. Glabrocingulum beggi Thomas, 1940; Carboniferous, Scotland. Diagnosis. Low- to moderately high-spired and turbiniform shell shape. The upper whorl surface forming an angle of <45 Ǫ with the selenizone located on the upper edge of whorl face. Sutures sharply defined. Upper whorl face with both spiral and collabral ornament; most strongly developed near the suture, weakest near the selenizone. Anomphalus to widely phaneromphalus, with or without funicle. Remarks. These specimens resemble the Permian genera Wannerispira, Ananias and Glabrocingulum, and the Triassic genus Kamupena. They differ from Wannerispira by possessing a selenizone in the upper third of the whorl, and only having two rather than three strong spiral ribs; from Ananias by being low- rather than high-spired and having a less conspicuous and thinner concave band below the selenizone; and from Kamupena by lacking a strong umbilical callus plug. These specimens also differ from other ... : Published as part of Foster, William J., Danise, Silvia & Twitchett, Richard J., 2017, A silicified Early Triassic marine assemblage from Svalbard, pp. 851-877 in Journal of Systematic Palaeontology 15 (10) on page 866, DOI: 10.1080/14772019.2016.1245680, http://zenodo.org/record/10883052 ... |
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