Tazarcus, a new phylogenetically unplaced genus of two flightless weevils <br />with metapleural ridge from the Eastern Arc Mountains, Tanzania (Coleoptera: Curculionidae: Molytinae)
Bibliographic record
Abstract
This paper reports new flightless forest litter weevils discovered in Tanzania. They are classified into two species of the genus Tazarcus gen. nov.: T. aeaea sp. nov. (the type species; from South Pare and West Usambara) and T. ogygia sp. nov. (Rubeho). Both new species inhabit the archipelago-type Eastern Arc Mountain rainforests renowned for the high diversity of their biota. Adults of Tazarcus are recognizable by their relatively small size (length of pronotum and elytra in dorsal view 2.0-3.4 mm), the short and straight rostrum covered dorsally with dense velvety pilosity, an antennal funicle with seven segments, a prosternal canal, procoxae separated, a lack of hind wings and effaced elytral shoulders. Remarkably, adults of Tazarcus possess a short longitudinal ridge on each metapleuron, which bears a line of serration likely homologous to sclerolepidia. A phylogenetic analysis of 72 terminals and 3134 aligned positions from one mitochondrial and two nuclear ribosomal fragments corroborated the monophyly of the new genus, of both new species and of all three sampled populations but did not identify the sister group of Tazarcus. Three other weevil taxa with adults possessing a similarly shaped metapleural ridge (the African Thrombosternus Marshall and Allocycloteres Voss and an unidentified species of Molytinae from Madagascar) did not cluster with Tazarcus, suggesting multiple origins of this structure. Tazarcus is taxonomically classified as incertae sedis in a non-monophyletic subfamily "Molytinae". Images and DNA sequences of all 72 herein analysed specimens are available online at dx.doi.org/10.5883/DS-VGDS011.
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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 | 0.001 |
| 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".