New Insights into Skeletal Morphology of the Oldest Known Silicoflagellates : <i>Variramus</i>, <i>Cornua</i> and <i>Gleserocha</i> gen. nov. = Nouvelles connaissances sur la morphologie du squelette desplus anciennes silicoflagellés connus : <i>Variramus</i>, <i>Cornua</i> et <i>Gleserocha</i> gen. nov.
Bibliographic record
Abstract
Two of the oldest known silicoflagellate-bearing sediments, lower Albian at Ocean Drilling Program Site 693 in the Weddell Sea of Antarctica and Santonian in the Devon Island sequence of the Canadian Archipelago, are re-examined with a focus on silicoflagellate genera Variramus, Cornua, and Gleserocha that lack basal rings, a feature appearing during late Santonian/early Campanian time within the genus Corbisema. The extraordinary variability of Variramus aculeifera is studied, and a new genus Gleserocha is proposed for taxa with apical structures made of three struts, but without pikes. This new genus includes previously described Variramus wisei and Cornua tapiae and new species G. harrisonii, and is here proposed as a genus transitional between Variramus and Cornua. Two unusual new species of Cornua, C. deflandrei and C. witkowskiana, are also described and a revised terminology is proposed for the skeletal components of Cornua and closely related genera. Abstract in French Les plus anciens silicoflagellés provenant des sédiments de l’Albien inférieur du Site 693 de l’Ocean Drilling Program (ODP) dans la mer de Weddell en Antarctique et des sédiments du Santonien des îles Devon de l’archipel arctique canadien sont revus, afin de mieux comprendre les genres Variramus, Cornua et Gleserocha qui ne possèdent pas d’anneau basal. Cette caractéristique est apparue au Santonien supérieur/Campanien inférieur en même temps que le genre Corbisema. Les variations étonnantes de Variramus aculeifera sont analysées et un nouveau genre, Gleserocha, est décrit, qui regroupe les espèces ayant une structure apicale sans épine et composée de trois entretoises. Ce nouveau genre incluant deux espèces déjà décrites comme étant Variramus wisei et Cornua tapiae et de la nouvelle espèce G. harrisonnii, est proposé pour constituer la forme de transition qui relie Variramus et Cornua. Deux nouvelles espèces inédites de Cornua, soient C. deflandrei et C. witkowskiana, sont aussi décrites et nous proposons une nouvelle terminologie pour décrire l’endosquelette de Cornua et des genres similaires.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".