A new species Of<i>Taniwhasaurus</i>(Mosasauridae, Tylosaurinae) from the upper Santonian-lower Campanian (Upper Cretaceous) of Hokkaido, Japan
Bibliographic record
Abstract
A new species of the basal tylosaurine mosasaur Taniwhasaurus, is described from materials collected from upper Santonian-lower Campanian marine clastics outcropping near Mikasa City, Island of Hokkaido, Japan. The type species, Taniwhasaurus oweni Hector, 1874, was originally described from a partial frontal and right and left dentaries collected from the middle Campanian, Conway Siltstone Formation at Haumuri Bluff, New Zealand. Taniwhasaurus n. sp. shares the diagnostic features of the generic type (i.e., prefrontal forms portion of naris precluding frontal-maxillary contact), but is differentially diagnosed at the specific level by features of the teeth (number of flutes), the postorbitofrontal morphology, the contact and degree of overlap of the premaxilla and frontal, and the morphology of the jugal. Recent recharacterization and rediagnosis of Lakumasaurus antarcticus Novas et al., 2002, as Taniwhasaurus antarcticus, establishes the existence of a third species of the genus, and broadens the paleogeographic and stratigraphic distribution of these animals in Upper Cretaceous circum-Pacific basins. These three species range temporally from the upper Santonian-lower Campanian to upper Campanian, and geographically, from the northern to the southern hemisphere. Endemism of the previously recognized species of Taniwhasaurus is contradicted by recognition of the first Japanese Taniwhasaurus.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 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".