Taxonomic utility of ankylosaur (Dinosauria, Ornithischia) osteoderms:<i>Glyptodontopelta mimus</i>Ford, 2000: a test case
Bibliographic record
Abstract
A new nodosaurid specimen from the Upper Cretaceous Naashoibito Member of the Ojo Alamo Formation in the San Juan Basin, New Mexico is assigned to Glyptodontopelta mimus Ford, 2000 based on characters of internal (histological) and external osteoderm morphology. This specimen is from the same stratigraphic horizon as the holotype (USNM 8610), and because it displays a wide range of osteoderm morphotypes, it can be used as a basis for comparison of osteoderm shape and sculpturing among different ankylosaur taxa. Its unique surface texture differentiates it from other Upper Cretaceous ankylosaurids and nodosaurids (Ankylosaurus, Nodocephalosaurus, Edmontonia, Euoplocephalus, and Panoplosaurus) and demonstrates that G. mimus is a valid taxon. The nodosaurid Edmontonia australis Ford, 2000 is considered a subjective junior synonym of G. mimus based on having the same surface texture and shape of the medial cervical osteoderms. Ankylosaur osteoderms are distinctive to at least the genus level and are commonly found in Upper Cretaceous strata, thus they have great biostratigraphic utility.
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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 | 0.001 | 0.002 |
| 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 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| 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 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".