A new onychodontid (Osteichthyes, Sarcopterygii) from the Upper Devonian (Frasnian) of Devon Island, Nunavut Territory, Canada
Bibliographic record
Abstract
We describe a new onychodontid, Onychodus mikijuk, from the Upper Devonian (Frasnian) Nordstrand Point Formation of the Grinnell Peninsula, Devon Island, Nunavut Territory, Canada, represented by tooth whorls, partial lower jaws, and a partial premaxilla. Among the species of Onychodus, O. mikijuk is distinguished by macroscopic raised longitudinal enamel ridges along the parasymphyseal teeth, a symphyseal plate that is taller than it is long with a raised posterior corner, and a weakly expanded contact between the lingual dentary flange and symphyseal plate. The lateral denticles of the parasymphyseal tooth whorl are inclined against the parasymphyseal teeth, as in adult Onychodus jandemarrai, which may indicate that, at least the largest specimens of this new species, were small adults rather than juveniles. This new species is the first record of an onychodontid from the Upper Devonian of the Canadian Arctic, the first from a riverine environment, and one of the youngest occurrences of the clade.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 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".