Ontogeny of <i>Parabolinella</i> <i>panosa</i> (Olenidae, Trilobita) from the uppermost Furongian (Upper Cambrian) of northwestern Canada, with discussion of olenid protaspides
Bibliographic record
Abstract
The ontogeny of Parabolinella panosa (the Family Olenidae) from the uppermost Furongian (Upper Cambrian) of the Rabbitkettle Formation, MacKenzie Mountains, northwestern Canada, is described. The protaspides are characterized by a highly convex lateral profile, parallel-sided axial furrows, and three pairs of fixigenal spines. Protaspid morphologies of eight olenid species, including P. panosa, demonstrate that the Olenidae, a widely accepted monophyletic group, displays surprisingly disparate morphologies during the protaspid period. The olenid protaspides show morphologic differences according to oxygenation conditions; the olenid protaspides from poorly oxygenated environments are smaller in size, and have a spindle-shaped axis, distinct anterior pits, and a smaller protopygidium, but lack anterior and mid-fixigenal spine pairs, while the other protaspides which lived in better oxygenated condition are larger, have three pairs of fixigenal spines and a larger protopygidium, and lack distinct anterior pits. Olenimorph form is retained by most, if not all, olenid holaspides, even by those which inhabited better oxygenated conditions, suggesting greater morphological plasticity in the protaspid period.
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| 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 | 0.001 |
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".