A reappraisal of tyrannosauroid fossils from the Iren Dabasu Formation (Coniacian–Campanian), Inner Mongolia, People’s Republic of China
Bibliographic record
Abstract
The hind limb of the lectotype of Alectrosaurus olseni is described in comparison with other tyrannosauroids. In addition to the autapomorphies described for Alectrosaurus by previous workers, the taxon possesses a specialized pes, where the distal condyles of the metatarsals and most phalanges are strongly elevated beyond the dorsal and ventral surfaces of the shaft of each bone, described here as the ‘pediculate’ condition. In comparison with the lectotype, previously reported Alectrosaurus and Tyrannosaurus bataar material from the Turonian of Uzbekistan, and fossils from the Kyzylkum Desert, are not referable to Alectrosaurus. A partial skull from the Iren Dabasu Formation is not referable to A. olseni because of the lack of shared diagnostic bones between it and the lectotype. Several features are shared between the skull, the holotype of Raptorex, and an isolated juvenile T. rex lacrimal, to the exclusion of other derived tyrannosauroids.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
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 teacher head, 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".