A NEW CAENAGNATHID OJORAPTORSAURUS BOEREI, N. GEN., N. SP. (DINOSAURIA, OVIRAPTOROSAURIA), FROM THE UPPER CRETACEOUS OJO ALAMO FORMATION (NAASHOIBITO MEMBER), SAN JUAN BASIN, NEW MEXICO
Bibliographic record
Abstract
A nearly complete pair of pubes is identified as a new caenagnathid oviraptorosaur, Ojoraptorsaurus boerei, n. gen., n. sp., based on having a spoon-shaped depression on the anterior dorsal surface of the pubic boot, an elongated anterior process of the pubic boot, a recessed enclosed pubic fossa, the distal end of the pubic shaft convex anteriorly, and a sub-trapezoidal pubic peduncle articulation surface. Ojoraptorsaurus boerei is most similar to ROM 43250 (previously assigned to Chirostenotes pergracilis Gilmore) from the Horseshoe Canyon Formation (upper Campanian-lower Maastrichtian) of Alberta, Canada, but differs from it in having a pubic fossa that is lower on the shaft, a trapezoidal-shaped articulation surface of the pubes, a shorter shaft length and in being more robust. ROM 43250 is placed in a new genus and species, Epichirostenotes curriei, that is much younger than Chirostenotes pergracilis (sensu stricto), which may include the holotype of Macrophalangia canadensis (CMN 8538) and a referred specimen TMP 79.20.1, all of which are from the Dinosaur Park Formation and predate E. curriei by nearly 3 million years. The holotype specimen of Epichirostenotes curriei (ROM 43250) differs morphologically from Chirostenotes pergracilis (sensu stricto), based on TMP 79.20.1, in features of the ischium. We note minor differences in the morphology of the left manus of the holotype of Chirostenotes pergracilis (CMN 2367) compared to TMP 79.20.1, suggesting that these two may not be conspecific. Ojoraptorsaurus boerei is from the Naashoibito Member of the Ojo Alamo Formation, San Juan Basin, New Mexico, and is part of the Alamo Wash local fauna. This fauna is considered to be 69 Ma and thus is early Maastrichtian in age. Ojoraptorsaurus boerei represents the southern-most occurrence of a caenagnathid in North America. It is the first and only known caenagnathid from New Mexico and from the lower Maastrichtian of North America.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
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".