A note on the phylogenetic position of Duartettix montanus within the subfamily Melanoplinae
Bibliographic record
Abstract
This research sheds light on the phylogenetic position of the recently described Caribbean species Duartettix montanus. Morphologically most similar to the Melanoplinae, especially the North American genus Melanoplus, it was assigned to that subfamily. The Orthoptera Species File, curiously, assigns Duartettix to the South American tribe Dichroplini. The present molecular phylogenetic analysis of portions of four mitochondrial genes, however, strongly rejects that allocation and instead supports an association with the northern melanoplines. Within the context of an “Out-of-South America” hypothesis proposed earlier for the subfamily's origin, it is speculated that the antecedents of Duartettix arose from ancestors on their northward movement, traversing a series of island arcs that intermittently connected the two Americas during the late Cretaceous. Of possible taxonomic interest, phylogenetic information is also provided for a number of South American melanoplines, notably members of the tribe Jivarini, which have not been previously analyzed using molecular methods.
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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 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".