The <i>Neogondolella constricta</i> (Mosher and Clark, 1965) group in the Middle Triassic of North America: speciation and distribution
Bibliographic record
Abstract
Abstract Neogondolella constricta (Mosher and Clark, 1965) from the Prida Formation at Fossil Hill in central Nevada was the first conodont described from Middle Triassic strata in North America. The species has since been widely reported from elsewhere despite uncertainties about its taxonomic scope and that of similar related taxa. Poor definition of these taxa has spawned a diverse nomenclature and inhibited use of the group in biozonation. Starting with a growth series of topotype N . constricta , we reassess allied contemporaneous taxa from North America. In Nevada, 11 conodont taxa are identified: N . constricta , N . aldae Kozur, Krainer, and Mostler, 1994b, N . cornuta Budurov and Stefanov, 1972, N. ex gr. mesotriassica (Kozur and Mostler, 1982), N . postcornuta (Kovács, 1994), N . posterolonga Kozur, Krainer, and Mostler, 1994b, N . quasiconstricta n. sp., N . quasicornuta n. sp., and three subspecies of N . excentrica Budurov and Stefanov, 1972. Successive associations of taxa display symmetry transition in posterior platform configuration. Subdivision of the upper Anisian–lower Ladinian is provided by dominant N . constricta plus relatively uncommon N . quasiconstricta n. sp. and N . excentrica primitiva n. subsp. in the Rotelliformis ammonoid zone. This is followed in the Meeki through the Subasperum zones by dominant N . cornuta , associated N . posterolonga , plus relatively uncommon N . quasicornuta n. sp., and a variety of asymmetric elements: the Meeki Zone includes N . aff. N . cornuta ; the Occidentalis Zone adds N . e . excentrica ; and finally, N . e . sigmoidalis n. subsp. appears in the Subasperum Zone. In British Columbia, the three subspecies of N . excentrica are recognized in, respectively, the Deleeni, Chischa, and Matutinum (and younger) ammonoid zones. UUID: http://zoobank.org/7d58c8c8-cd68-498f-bb84-5d43de47f779
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".