Eggs of titanosaurid sauropods from the Upper Cretaceous of Auca Mahuevo (Argentina)
Bibliographic record
Abstract
We provide a detailed description of the sauropod eggs from the Late Cretaceous nesting site of Auca Mahuevo (Neuquén Province, Argentina), the only eggs that are unequivocally associated with titanosaurid dinosaurs. These eggs are subspherical averaging 132 by 115 mm. Well-preserved specimens display a pronounced eggshell ornamentation that consists mostly of single nodes averaging 0.58 mm in diameter and 0.28 mm in height (base to apex) with internodular values of 0.52 to 0.87 mm. The pore canal network consists of vertical and horizontal canals intersecting at the bases of eggshell units. Vertical canals may fork defining a "Y" pattern and their diameters vary between 0.08 and 0.2 mm. Their surficial apertures of 0.15 to 0.29 mm are funnel like and located between the surficial nodes. In pristine specimens, the eggshell thickness equals 1.31 mm, and radial sections exhibit a single structural horizontal layer composed of juxtaposed shell units consisting of acicular calcite crystals radiating from an organic core. Relying only on taxonomically identified oological material, we regard this character also shared in the innermost layer (layer 1) of Deinonychus antirrhopus, oviraptorid theropods, and observed during an early oogenetic stage in extant bird as primitive for saurischians. The eggshell morphology advocates that these eggs were likely incubated in moist nesting environments, perhaps such as nests covered with vegetal matter. Examination of the South American megaloolithid eggshells reveals that the titanosaurid eggs from Auca Mahuevo are mostly similar to those described as Megaloolithus patagonicus and Megaloolithus pseudomamillare.
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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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| 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".