A new lizardfish (Teleostei, Aulopiformes) from the Late Cretaceous Bearpaw Formation of Alberta, Canada, with a revised diagnosis of <i>Apateodus</i> (Aulopiformes, Ichthyotringoidei)
Bibliographic record
Abstract
A new aulopiform, Ursichthys longiparietalis, gen. et sp. nov., preserved within and around the body cavity of a mosasaur, Mosasaurus missouriensis, is described from the Bearpaw Formation (upper Campanian, ca. 74.8 Ma) of Alberta, Canada (paleolatitude = 57°N). The partial skeleton consists of a partial skull associated with other isolated bones, including parasphenoid, hyomandibula, cleithrum, caudal peduncle centrum, scale, and many disarticulated fin rays. Many of those elements show evidence of bite damage considered to have been inflicted by the mosasaur. This taxon can be differentiated from other aulopiforms in having a dorsoventrally compressed neurocranium; short frontals; large, long, rectangular parietals that contact at the midline and are situated anterior to the supraoccipital; triangular epiotics, with the facet for the dorsal arm of posttemporal centered over the epiotic; hyomandibula head articulating anteriorly with only the pterotic and sphenotic; cleithrum with a long, narrow, straight vertical shaft; mesacoracoid present; and centra with two lateral, elongate fossa. Total length is estimated at 100 cm and age is estimated at 7 years old. We also emend the diagnosis for Apateodus to include more cranial characteristics. Among 37 known genera of Cretaceous aulopiforms, the diversity at the K-Pg boundary is probably underrepresented. Fish skeletons have rarely been recovered from the Bearpaw Formation in Alberta, likely due to a preservational bias. This report, however, shows promise for additional fish material preserved in mosasaur skeletons because they are relatively more commonly preserved than fish skeletons.http://zoobank.org/urn:lsid:zoobank.org:pub:3E66B383-47BC-4E77-9BA6-F33B205AAE3B
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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) | 0.001 | 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 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".