<i>Cloeon tzeltal</i> sp. nov. (Ephemeroptera: Baetidae), a Miocene mayfly from Mexican amber
Bibliographic record
Abstract
A new fossil species of mayfly of the genus Cloeon Leach, 1815 (Ephemeroptera, Baetidae) is described. The type material comprises female imagines from 24 amber inclusions, from Miocene strata of Chiapas in southern Mexico. The fossil species, Cloeon tzeltal sp. nov., closely resembles those in the genus Cloeon by the following diagnostic characters: absence of hind wings; two major crossveins between R1 and R2 not in line with the crossveins below them; single marginal intercalaries; and basal crossveins between veins R and Rs situated more basally than the following vein. The new species can be distinguished from extant species of Cloeon by the absence of colored costal and subcostal fields in the forewings and the absence of transversal veins in vitta broadly bordered with white. Extant species of the genus Cloeon in America have an exclusive distribution in the northern part of the continent; with the exception of one introduced taxon, no valid species have been recorded in the tropics. As such, the fossil record of Cloeon in the southernmost part of North America suggests a broader geographic distribution of this genus in the geological past, including the southernmost part of North America.
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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 | 0.001 |
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".