Anatomy and systematics of<i>Plesiobaena antiqua</i>(Testudines; Baenidae) from the mid-Campanian Judith River Group of Alberta, Canada
Bibliographic record
Abstract
New material of Plesiobaena antiqua from the mid-Campanian Judith River Group of Alberta, Canada, fully documents the skeleton in this species and provides evidence regarding variation within the taxon. Size-independent variation is present in the size of the nasals. Variation in the degree of entry of the frontal into the orbital margin is size-related. The shell varies in the presence or absence of the seventh neural, presence of a ninth neural, and fusion of the eleventh and twelfth peripherals. Plesiobaena antiqua is restricted to the Campanian. The late Maastrichtian specimens previously included in the species differ in the absence of the following features: pointed crista supraoccipitalis, parietal-postorbital sutures strongly divergent from midline, maxilla meeting postorbital excluding jugal from orbit margin, short contact between pterygoids at midline, fused first and second peripheral, and first marginal located mostly, or entirely, on nuchal. The late Maastrichtian specimens are distinct from the Paleocene species P. putorius in the degree of development of the skull roof and presence of sulci on the skull roof, but the two taxa share two derived features suggesting that they form a monophyletic clade relative to P. antiqua. The distribution of P. antiqua within the Campanian of North America suggests that it was a member of a northern faunal assemblage.
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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 | 0.002 | 0.002 |
| Science and technology studies | 0.003 | 0.002 |
| Scholarly communication | 0.001 | 0.000 |
| 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".