Phylogenetically problematic Aater cangshanensis gen. et sp. nov. from Southwest China suggests multiple origins of prosternal canal in Molytinae weevils (Coleoptera: Curculionidae)
Bibliographic record
Abstract
A new weevil taxon, Aater cangshanensis gen. et sp. nov. is established for a single female specimen sifted from the forest litter on the Cang Shan Mountain Range in Yunnan, China. This small flightless beetle (the combined length of pronotum and elytra is 3.4 mm) has relatively long and straight rostrum, contiguous procoxae and tuberculate elytra with effaced shoulders. Remarkably, the new genus has a prosternal canal on the ventral side of the prothorax. This feature is characteristic to the weevils of the Old World nominal tribe Aminyopini (=Euderini of some authors) and to the China-Nepal genus Niphadomimus (Typoderini). A phylogenetic molecular analysis using an alignment of 2,956 bp from one mitochondrial and two nuclear fragments outputted a mainly inconclusive topology with low backbone resolution. Terminals with prosternal canal were grouped into four clades not most closely related to each other: Aater cangshanensis gen. et sp. nov., Niphadomimus, African Aminyopini and Asian Aminyopini; the latter three clades each with bootstrap support of 100%. The prosternal canal has either evolved more than once, or reversed once or more, or both. The sister group of Aater gen. nov. cannot be reliably identified and, therefore, the new genus is assigned to Molytinae incertae sedis.
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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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".