Morphological insights into the lobster genus Uncina Quenstedt, 1851 based on new material from the Ya Ha Tinda Konservat-Lagerstätte, Canada (Early Jurassic)
Bibliographic record
Abstract
It is rare to find Early Jurassic crustacean material outside of Europe but the discovery of the Ya Ha Tinda Konservat-Lagersttte in Alberta, Canada, has significantly increased the number of crustacean specimens, specifically of the genus Uncina. New articulated specimens of Uncina pacifica and Uncina ollerenshawi preserve most of the cephalothorax and pleon, not just the chelae of the first pereiopod. This new material from Ya Ha Tinda permits revised morphologic descriptions as well as a quantitative analysis of the intra-and interspecific variability of Uncina claw morphology. Morphometric similarities and differences are noted between species, indicating that a notch at the distal end of the occlusal surface of the fixed finger is diagnostic for the genus. Our findings suggest that Uncina species are usually isochelous, with the exception of Uncina pacifica, which is heterochelous. The two co-occurring species of Uncina in the Ya Ha Tinda Formation, Uncina pacifica and Uncina ollerenshawi, likely occupied different niches, based upon differences in chela morphology.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.011 | 0.009 |
| Science and technology studies | 0.004 | 0.004 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.008 | 0.002 |
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".