Development of the dermoskeleton in<i>Superciliaspis gabrielsei</i>(Agnatha: Osteostraci)
Bibliographic record
Abstract
ABSTRACT Osteostracans are Paleozoic jawless vertebrates, likely the sister group to gnathostomes (jawed vertebrates). It was previously believed that the osteostracan dermoskeleton began ossification when the individual neared adult size, restricting further growth once a dermoskeletal covering was achieved. However, we describe here small, well-preserved articulated specimens of the osteostracan Superciliaspis gabrielsei. These specimens are the best-known juvenile osteostracans, and document dermoskeletal development at an evolutionary stage highly relevant to the origin of gnathostomes. Ossification began before the animal reached 20% of adult size. Bones grew by multiple means, including initiation of new bone units, marginal growth, and fusion into larger bones. In the head, paired elements were among the first to ossify. In the trunk dermoskeleton of juvenile heterostracans, bones developed first along the midline, but in Superciliaspis gabrielsei, a lateral to median polarity is seen, with ventrolateral ridge scales the first to appear.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 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) | 0.001 | 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 teacher head, 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".