A new monotypic family for the enigmatic crustose red alga Plagiospora gracilis.
Bibliographic record
Abstract
Plagiospora gracilis, a mucilaginous crustose red alga growing on subtidal pebbles on \nboth coasts of the North Atlantic Ocean, forms distinctive tetrasporangia (red algal \nmeiotic structures that release haploid tetraspores) but gametophytes have never been \nreported. In the absence of gametangia, the taxonomic position of this monotypic genus \nhas always been uncertain; it is currently placed provisionally in the Gloiosiphoniaceae \n(Gigartinales) by comparison with sporophytes of Gloiosiphonia obtained in culture. \nDioecious gametophytic crusts of P. gracilis are now reported for the first time, forming \ngametangia in inconspicuous superficial sori. There is no evidence that fertilization ever \noccurs in the field although fertile males and female were collected together. In culture, \ntetraspores grew into tetrasporophytes for three successive generations, by presumed \napomictic sporophyte recycling. The life history of P. gracilis may represent a late stage \nin the loss of sexual reproduction leading to tetraspore-to-tetrasporophyte life histories \nsuch as that in Hildenbrandia. Phylogenetic analysis of sequences of the rbcL, LSU \n(28S) rDNA and coxI (COI-5P) genes for P. gracilis with other Gigartinales resolved P. \ngracilis as a distinct lineage in a well-supported clade of the families Sphaerococcaceae, \nGloiosiphoniaceae, Endocladiaceae, Nizymeniaceae and Phacelocarpaceae. We here \npropose the monotypic Plagiosporaceae fam. nov. to accommodate P. gracilis.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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 teacher head, 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".