<p><strong>Systematic revision of the trilobite genera <em>Laudonia</em> and <em>Lochmanolenellus</em> (Olenelloidea) from the lower Dyeran (Cambrian Series 2) of western Laurentia</strong></p>
Bibliographic record
Abstract
The olenelloid trilobite genus Laudonia Harrington, 1956 was thought to occur widely along the Cordilleran margin of Laurentia in lowermost Dyeran strata (Cambrian Series 2). However, supposed occurrences in the Rosella Formation (Cassiar Mountains, northern British Columbia), the Mural Formation (Cariboo Mountains, east-central British Columbia) and the Poleta Formation (Nevada)--re-examined, morphometrically analyzed, and fully documented for the first time herein--are found to actually represent occurrences of species of Lochmanolenellus Lieberman, 1998. This revision results in the restriction of Laudonia to two species--Laudonia bispinata Harrington, 1956 and Laudonia amputata Fritz, 1992--that are known only from the Mural Formation of the Mount Robson area (Canadian Rocky Mountains, Alberta/British Columbia) and are therefore of little biostratigraphic utility. Conversely, taxonomic and morphological diversity within the formerly monotypic Lochmanolenellus is greatly expanded by the description of three new species plus several in open nomenclature. The new species form a stratigraphic succession comprising Lochmanolenellus pentagonalis n. sp. (oldest) followed by Lochmanolenellus subquadratus n. sp. and then Lochmanolenellus trapezoidalis n. sp. (youngest) in the Cassiar Mountains and in Nevada, and thus seem to offer some biostratigraphic utility. Lochmanolenellus primus (Lochman in Cooper et al., 1952), the genotype, occurs only in the Puerto Blanco Formation (Caborca area, Sonora). These new data, combined with a comparative study of the ontogenetic development of the cephalon of each of the new species of Lochmanolenellus to other olenelloids, strongly suggest that Lochmanolenellus is closely related to "wanneriid" olenelloids such as Wanneria Walcott, 1910 and Elliptocephala Emmons, 1844 rather than to biceratopsid olenelloids.
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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 | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.002 | 0.003 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.002 |
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".