Thanatotheristes Voris & Therrien & Zelenitsky & Brown 2020
Bibliographic record
Abstract
Thanatotheristes degrootorum is a new genus and species of derived tyrannosaurine from the middle Campanian of Alberta, Canada. Whereas this taxon is most closely related to Daspletosaurus, Thanatotheristes is morphologically distinct based on several characters and autapomorphies. Together, Thanatotheristes and Daspletosaurus form a clade of long- and deep-snouted tyrannosaurines, here referred to as Daspletosaurini. The recovery of additional clades in our phylogenetic analysis, including Albertosaurinae, Alioramini, short-snouted taxa like Teratophoneus, and gigantic taxa like Tyrannosaurus, reveals that at least five major radiations occurred within Tyrannosauridae and suggests greater disparity within the group than previously thought. Paleogeographic segregation of tyrannosaurid clades across North America during the Campanian provides renewed evidence for provinciality among Laramidian tyrannosaurids, with Teratophoneus / Lythronax - Bistahieversor being endemic to southern Laramidia and Albertosaurinae-Daspletosaurini being endemic to northern Laramidia. Despite the co-occurrence of Daspletosaurini and Albertosaurinae in northern Laramidia, the former is more common in southernmost Alberta and Montana and the latter is more common farther north, in central and southcentral Alberta, suggesting the presence of a latitudinal gradient. Thus, the absence of Daspletosaurini in the lower Maastrichtian deposits from south-central Alberta (i.e. Horseshoe Canyon Formation) could reflect this latitudinal gradient rather than their extinction.
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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 | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.013 | 0.004 |
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".