Psammonobiotus dziwnowi and Corythionella georgiana, two new freshwater sand-dwelling testate amoebae (Rhizopoda: Filosea)
Bibliographic record
Abstract
Summary. Two new species of the predominantly marine sand-dwelling testate rhizopod genera Psammonobiotus and Corythionella were discovered in sand beaches of the Canadian Laurentian Great Lakes. The most important differences between P. dziwnowi sp. n. its closest relative P. communis are (i) much smaller size of P. dziwnowi, (ii) greater length-to-width ratio in P. dziwnowi, (iii) greater angle of the plane of the oral aperture relative to the long axis of the test of P. dziwnowi. The only other known freshwater species of Corythionella, C. golemanskyi Nicholls, occurred together with C. georgiana sp. n. in samples from Wasaga Beach, Georgian Bay (Lake Huron) and enabled a direct comparison of test morphology of both populations occurring under the same environmental conditions. As well as a sign ificantly smaller test size in C. georgiana, other differences with C. golemanskyi include smaller more elongate scales arranged in a more open nonoverlapping pattern on the test surface of C. georgiana. Notwithstanding some uncertainties about the taxonomy of C. acolla, which is the only one of six marine species of Corythionella lacking a flared pseudostomal collar, the differences between it and C. georgiana, which has a minimally flared collar, include a generally shorter length, a much broader post-pseudostomal region and greater ratio of test widthto-pseudostome diameter in C. georgiana. These differences (ignoring, for the present, possible additional differences in the structure of the scale layer on the tests of C. georgiana and C. acolla), substantiate the designation of C. georgiana as an independent species.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".