A New Ichnospecies of<i>Cubiculum</i>from Upper Cretaceous Dinosaur Bones in Western Argentina
Bibliographic record
Abstract
The new ichnospecies Cubiculum levis is described as a bowl-shaped bioerosion trace fossil in dinosaur bone from the Upper Cretaceous of western Argentina. The systematic description is based on specific ichnotaxobases for bioerosion trace fossils in bones. The main characteristics of the new ichnospecies are its general bowl-shaped morphology with marked concavity of the flanks and bottom, marked constriction of walls in the upper area, and the absence of bioglyphs in the interior surface. To establish a hierarchical approach to the taxonomy of Cubiculum, we propose an emended diagnosis for this ichnogenus. Based on comparative analysis with structures of fossil pupal chambers and results of actualistic experiments with carrion insects, the ethology of C. levis is interpreted as Pupichnia. Paleoenvironmental conditions at the paleontological site, taphonomic data and the morphology of C. levis indicate a continental arthropod producer with the biological and anatomical ability to bore bone. The producer was probably a Cretaceous coleopteran with a heavily sclerotized body and well-developed biting mouthparts. We emphasize the importance of establishing paleoethologic and paleobiologic inferences based on testable data provided by multiple sources, such as biology, physiology, sedimentology, and forensic sciences. Finally, we cite some relevant reports of traces fossils in bones interpreted as pupal chambers and we discuss the conflicting interpretations of their producers and ecological significance.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 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".