A review of the evolution, biostratigraphy, provincialism and diversity of<scp>M</scp>iddle and early<scp>L</scp>ate<scp>T</scp>riassic conodonts
Bibliographic record
Abstract
Abstract The taxonomy, diversity, evolutionary lineages, and stratigraphical distributions ofMiddle and earlyLateTriassic conodonts are reviewed and re‐evaluated. Twenty‐five genera are recognized in theMiddle and earlyLateTriassic, including a new genus cited in open nomenclature. Of these, 24 genera are assigned to two families and seven subfamilies. The familyGondolellidae consists of the subfamiliesCornudininae,Epigondolellinae,Neogondolellinae,Novispathodinae,Paragondolellinae andPseudofurnishiinae. The familyGladigondolellidae is monotypic, consisting of the subfamilyGladigondolellinae. The genusNeostrachanognathusis not assigned to any family or subfamily as its origin is unclear. Conodont provincialism was low in the earlyAnisian, but from the lateAnisian faunistic differences started to increase and became stronger during the earlyLadinian, reaching a peak around the mid‐Ladinian. Provincialism remained strong until the earliestCarnian and changed to an all‐Triassic low in the earlyTuvalian. The provincialism betweenNorthAmerica andTethys rebounded on the specific level during the lateTuvalian. Diversities on generic and specific levels have been established, and two major conodont diversity cycles are recognized: the first ranges from theBithynian (earlyAnisian) to theJulian (late earlyCarnian), and the second is restricted to theTuvalian (lateCarnian).
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.008 | 0.010 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| 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".