A new species of the genus Sheathia (Batrachospermaceae, Rhodophyta) from Japan
Bibliographic record
Abstract
We describe herein a new species of Sheathia from Chiba Prefecture, Japan (previously attributed to S. arcuata) based on morphological studies and molecular analyses of rbcL and COI-5P DNA sequences. We assign the binomial Sheathia yoshizakii sp. nov. to this new entity. The rbcL and COI-5P analyses suggest that S. yoshizakii is distinct from other Sheathia species. Sheathia yoshizakii is characterized by homocortication, a carpogonium with clavate to lanceolate trichogyne, and exerted carposporophytes. Although S. yoshizakii is distinguished from other Sheathia species by rare production of secondary fascicle and relatively long carpogonial branch, more than seven carposporophytes per whorl, and frequently exerted carposporophytes, these morphological characters are variable and consistent with the general circumscription of S. arcuata. Sheathia yoshizakii is the first Sheathia species confirmed by DNA sequence data in Japan.
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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 | 0.001 | 0.001 |
| 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".