Cultivation of <i>Ancyromonas melba</i>, and Reclassification as the Type Species of <i>Divimonas</i> gen. nov., a Phylogenetically Important Ancyromonad Lineage
Bibliographic record
Abstract
Ancyromonadida is a taxon of small heterotrophic flagellates occupying an unresolved but deep-branching position in the eukaryotic tree of life, thus suspected to be important to studies of early eukaryotic evolutionary relationships and the characteristics of the last eukaryotic common ancestor. Sampling and cultivation of the full diversity of ancyromonad species are therefore areas of considerable interest. Ancyromonas melba is a species originally described from hypersaline material for which no monoprotistan culture or molecular data have been available, but whose distinct morphology suggests it may represent a new major lineage within Ancyromonadida. We report the first cultivation of this morphospecies in hypersaline media, with characterization including scanning electron microscopy and small subunit rRNA gene sequencing. Distinguishing morphological features include the predominantly ventral placement of the ventral groove, the approximately equal thickness of the anterior and posterior flagella, and the relatively long anterior flagellum. Phylogenetic analysis shows that the isolate does not branch within Ancyromonas or any other currently described genus of Ancyromonadida, but represents a novel genus-level lineage, the position of which within ancyromonads could not be robustly inferred. We therefore propose a new genus for this species and rename it Divimonas melba n. gen., n. comb.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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".