A redescription of the skull of Euoplocephalus tutus (Archosauria: Ornithischia): a foundation for comparative and systematic studies of ankylosaurian dinosaurs
Bibliographic record
Abstract
Euoplocephalus tutusLambe (1902) from the Late Cretaceous of North America, was the first ankylosaurian dinosaur known from significant cranial material. Previous descriptions of this and other members of the Ankylosauria have been constrained by a paucity of material and an extremely apomorphic skull architecture, including the pervasive development of an embossing osseous ornamentation, and the absence of traditional morphological landmarks. A relative abundance of more recently collected and prepared cranial material attributable to Euoplocephalus enables a reappraisal of this taxon (including the type specimen), and permits it to be employed as a morphological representative of the clade. In recognition of previous difficulties encountered due to peculiarities of ankylosaurian anatomy, a fresh descriptive approach is necessitated. Herein, the skull is subdivided into five mutually exclusive topographic regions, within which individual elements are assigned with the assistance of outgroup comparison. Euoplocephalus is characterized by a distinctive pattern of cranial sculpturing across the preorbital area, relatively small, variably fluted teeth lacking a cingulum, a modified palpebral and a shallow nasal vestibule. Among ankylosaurine ankylosaurs, Euoplocephalus is unique in having medially inflected maxillary tooth rows. Osteological evaluation of the type skull of Anodontosaurus lambeiSternberg, 1929 supports its placement into synonymy with Euoplocephalus.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.003 | 0.002 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| 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".