Redescription and rediagnosis of the tylosaurine mosasaur <i>Hainosaurus pembinensis</i> Nicholls, 1988, as <i>Tylosaurus pembinensis</i> (Nicholls, 1988)
Bibliographic record
Abstract
ABSTRACT Tylosaurus pembinensis (Mosasauridae; Tylosaurini), from the middle Campanian Pembina Member of the Pierre Shale, exposed near Morden, Manitoba, Canada, is redescribed and removed from the genus Hainosaurus. In support of our reassignment, we highlight incorrect diagnostic features in the original description that were used as support for the assignment of the new species to Hainosaurus (e.g., small suprastapedial process of the quadrate and the presence of 54 vertebrae in the dorsal and pygal series [33 dorsals and 21 pygals]). In contrast, we note that the fully prepared quadrate possesses key Tylosaurus features such as a moderately large-sized suprastapedial process. We also report that of the original 54 ‘pre-chevron’-bearing vertebrae, that 26 are from a second, unrelated species of mosasaur. Of the 29 remaining vertebrae, it is difficult, due to poor preservation, to identify which of these elements are pygals. Although the exact pre-chevron count is unclear, the preserved remains clearly do not support a diagnosis of a high pygal count consistent with Hainosaurus. In recharacterizing Tylosaurus pembinensis, we discuss a number of problematic characters used to diagnose Hainosaurus, in the context of diagnosing Tylosaurus and not for the purpose of revising the European taxon Hainosaurus bernardi.
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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 | 0.001 |
| 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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".