<i>Eusthenopteron jenkinsi</i> sp. nov. (Sarcopterygii, Tristichopteridae) from the Upper Devonian of Nunavut, Canada, and a Review of <i>Eusthenopteron</i> Taxonomy
Bibliographic record
Abstract
New material from the Upper Devonian (Frasnian) Fram Formation of Ellesmere Island, Nunavut, Canada, represents a new large-bodied species of Eusthenopteron. The complete and well-preserved nature of the fossil material enables a description of anatomy that is otherwise poorly represented in most Eusthenopteron species; this includes braincase (ethmosphenoid and otic-occipital), scapulocoracoid, and pectoral fin. The new species is distinguished from other Eusthenopteron species by its large body size, pitted rather than tuberculated dermal cranial ornament, a distinct caudolateral margin of the vomer, an unossified basicranium, and a horizontally oriented hyomandibula. A large sample size and decades of detailed study of Eusthenopteron foordi have resulted in an important anatomical understanding of that species, but a lack of autapomorphies has complicated efforts to diagnose the grouping Eusthenopteron. We review the taxonomic history of Eusthenopteron and provide a new diagnosis that relies on a combination of discrete features that are commonly preserved and unaffected by specimen quality.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.003 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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 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".