The early middle Cambrian agnostid Pentagnostus praecurrens (Westergård 1936) from Sweden
Bibliographic record
Abstract
New material from autochthonous and allochthonous strata in Jamtland and southern Lapland of the agnostid species Pentagnostus praecurrens (Westergard 1936) is analysed. In Scandinavian biostratigraphy, 'P. praecurrens' is the index species of the lower middle Cambrian 'Acadoparadoxides pinus - Pentagnostus praecurrens' Zone of the 'Baltoparadoxides oelandicus' Superzone. Apart from the holotype cephalon and one aberrant complete specimen, only three detached cephala and six pygidia were previously illustrated. Their association was ambiguous and five of eleven specimens were recently re-assigned to other genera. New complete specimens in the present study enable a clear assignment of cephala to pygidia. Length-width measurements combined with a multivariate analysis of cephala were used to quantify the relationship of the new material and the results are discussed. The thorax is described for the first time. More than 100 specimens allow a clear appreciation of the morphological variation of the species and comparison to populations in other regions. Occurrence in Scandinavia is restricted to the 'Acadoparadoxides pinus - Pentagnostus praecurrens' Zone of Sweden. Occurrence in the younger 'T. gibbus' Zone of Sweden is doubtful. Outside Sweden the species occurs in the 'P. praecurrens' Zone in England, Canada and Australia. In Russia, P. praecurrens has a range from the 'P. praecurrens' Zone to the 'T. gibbus' Zone and may range even into the lower part of the 'Acidusus atavus' Zone.
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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 | 0.004 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 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".