New species of the plesiadapiform <i>Paromomys</i> Gidley (Primates, Paromomyidae) from the Paleocene of southwestern Alberta, Canada
Bibliographic record
Abstract
Paromomyidae are a taxonomically diverse family of archaic primates known principally from deposits of Paleocene and Eocene age in North America. While often numerically abundant in local mammalian faunas, the various paromomyid taxa are most often represented by isolated teeth and rare dentigerous cranial and dentary fragments. Accordingly, paromomyid interrelationships are on balance poorly understood, and this is especially true for early branching taxa. We report here on two new species of Paromomys—long considered the earliest diverging paromomyid—from Paleocene deposits in southwestern Alberta. Paromomys borealis sp. nov. and Paromomys ignis sp. nov. bear closest resemblance to Paromomys depressidens and Paromomys maturus, respectively, and represent the first occurrences of the genus in Canada. A phylogenetic analysis of all paromomyid species resulted in overall poor resolution. Paromomys was recovered as non-monophyletic—consistent with previous results—with species either in a polytomy or positioned at increasingly crownward positions. In contrast to previous hypotheses, the position of Paromomys as the earliest diverging paromomyid was rendered equivocal. Notably, two recently described species of Ignacius from the Canadian Arctic resolved as sister to Acidomomys to the exclusion of other paromomyids. The newly discovered species of Paromomys are known from a vanishingly small number of specimens, and paromomyid diversity and overall abundance declined markedly through the Tiffanian in Alberta; in contrast, plesiadapoids—generally rare in the Torrejonian—increased significantly in diversity and abundance during the same interval.
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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) | 0.001 | 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 | 0.000 |
| 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".