Taxonomic and molecular studies of the family Sebdeniaceae (Sebdeniales, Rhodophyta): new species of<i>Lesleigha gen. nov.</i>and<i>Crassitegula</i>from Hawaii, east Asia and Lord Howe Island
Bibliographic record
Abstract
The genus Lesleigha gen. nov., based on L. hawaiiensis sp. nov. from Oahu in the Hawaiian Islands, is characterized morphologically and anatomically and strongly supported as distinct from the other genera of the family Sebdeniaceae (Sebdenia and Crassitegula) primarily on the basis of mitochondrial COI-5P and nuclear SSU and LSU ribosomal DNA sequences. Characters distinguishing Lesleigha from Sebdenia include the repent, dorsiventral habit, nemathecial tetrasporangia, and irregularly cruciate tetrasporangial division pattern. Although these features are equally displayed by the recently described Crassitegula from Bermuda, that genus appears to differ from Lesleigha anatomically by its lack of a fusion cell subtending the gonimoblast, although in the absence of carposporophytes it is virtually necessary that DNA-sequence analyses be conducted before a distinction between Lesleigha and Crassitegula can be certain. Besides Lesleigha hawaiiensis, L. howensis sp. nov. is newly described from Lord Howe Island in the southern Pacific, and the Japanese and Korean Sebdenia yamadae is transferred to Lesleigha as L. yamadae, based on habit and anatomical conformity as well as DNA sequences. In addition, a new species of Crassitegula, C. imitans, is described from Lord Howe Island. The existence of further sebdenialean taxa is documented although not formally treated, indicating that substantial additional diversity most likely still awaits discovery in this reputedly species-poor order.
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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".