The cranial osteology of Belebey vegrandis (Parareptilia: Bolosauridae), from the Middle Permian of Russia, and its bearing on reptilian evolution
Bibliographic record
Abstract
The redescription of the cranial anatomy of Belebey vegrandis, a Permian bolosaurid reptile from southern Russia, provides valuable new information for determining the phylogenetic relationships of this enigmatic group of early amniotes.As exemplified by the superbly preserved skulls and mandibles of Belebey , bolosaurids are characterized by the following attributes: the presence of a unique, heterodont marginal dentition; a slender, anteroposteriorly elongate lower temporal fenestra that is bound mainly by the quadratojugal and squamosal bones; a large coronoid process formed by three bones; a splenial that is restricted to the ventral surface of the mandible; and a long anterior process of the prearticular that covers much of the medial surface of the dentary bone.The palate of Belebey appears to be greatly modified in the region of the snout, indicating the presence of a functional secondary palate.Phylogenetic analysis of Palaeozoic amniotes indicates that bolosaurids are parareptiles and the sister taxon to the clade comprised of Macroleter , Procolophonia, and Pareiasauria.This position, which is high within Parareptilia, necessitates long ghost lineages for several Late Permian Russian and South African taxa, because the oldest known bolosaurids have been found close to the Permo-Carboniferous boundary in New Mexico.
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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 | 0.003 | 0.001 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".