<i>Magniporophytum</i> gen. nov. and <i>Orientalilithon</i> gen. nov. (Hapalidiales, Corallinophycidae): Two new genera of coralline red algae from the Pacific Ocean, including the description of three new species
Bibliographic record
Abstract
We propose, based on a robust set of molecular and morpho-anatomical data of specimens from warm-temperate Japan, two new genera of non-geniculate coralline algae accommodating both attached and rhodolith-forming species: Magniporophytum gen. nov. containing M. variabile sp. nov. (the generitype) and M. epizoicum sp. nov. as well as Orientalilithon gen. nov. containing O. confluens sp. nov. (the generitype) and two undescribed Orientalilithon spp. Our multigene phylogenies inferred from psbA, rbcL, and SSU rDNA gene sequences demonstrated the distinct phylogenetic placements of Magniporophytum and Orientalilithon within the Hapalidiales; however, their generic positions have yet to be confirmed. In the psbA gene analyses, an undescribed Hapalidiales sp. 2 from Canada was separately grouped with the congeners of Magniporophytum from Japan, while an undescribed Lithothamnion sp. 5 from Taiwan was conspecific with Orientalilithon sp. 2 from Japan. Morpho-anatomically, the two new genera share some degrees of overlapping characters but can be distinguished by the shape of epithallial cells and the size of tetra/bisporangial pore openings compared to the surrounding rosette cells in surface view. The new genera differ from other phylogenetically related or morpho-anatomically similar genera by a suite of characters regarding epithallial cells, sub-epithallial initials, and tetra/bisporangial conceptacle characters. Within Magniporophytum, M. variabile and M. epizoicum are barely distinguishable, with a single difference in growth form. This study has highlighted a plausible generic character within the Hapalidiales along with the crypticity of coralline algae at both genus and species ranks and the extended distributions of Magniporophytum and Orientalilithon in the North Pacific Ocean.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| 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 | 0.001 |
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".