Eunotia petasum Siver, Oddsund & Lott 2022, sp. nov.
Bibliographic record
Abstract
Eunotia petasum Siver, Oddsund & Lott sp. nov. (LM Figs 15–21, SEM Figs 22–27) Description:— Valves are dorsi-ventral, elongate, widest in the middle of the valve, and becoming tapered and drawn out at the apices forming protracted ends (Figs 15–21). The ventral margin is concave, becoming slightly linear at the apices. The dorsal margin is more convex relative to the concave ventral margin such that the valve becomes progressively narrower from the center to the apices (Figs 24–27). Valves range in length from 19.6–57.6 µm with a mean of 38 µm, and in diameter at the valve center from 2.9–5.1 µm with a mean of 3.8 µm (n=25). At the apices, valve width ranges from 1.5–2.2 µm, with a mean of 1.8 µm. The margins of the valve face, especially along the ventral side, are slightly thickened and form right angles with the mantle (Figs 23–24). Striae are parallel, widely spaced with 13.5–19 per 10 µm, a mean of 16 µm, and consist of small, circular areolae that are opened on both the external and internal valve surfaces. Striae are continuous from the valve face onto the dorsal mantle, but may be interrupted and discontinuous with those on the ventral mantle (Figs 23–24). On smaller valves, the areolae on the ventral mantle may become more randomly spaced, especially below the raphe branches (Fig. 23). The mantle is shallow, approximately 1.5–2 µm, and the margin slightly thickened around each apex. The proximal end of the raphe commences near the middle of the mantle approximately 1/4 to 1/3 of the valve length from the apex, rises slowly on a linear path to the valve margin, and then bends up and onto the valve face terminating close to the end of the valve (Figs 23, 25). The proximal and distal raphe fissures both terminate as small round pores (Figs 23–25). On most specimens, the portion of the mantle below the raphe consists of short striae composed of a few pores, but on some valves the pores are randomly spaced and not organized into distinct striae. Internally, the distal raphe fissure terminates within a small helictoglossa positioned about 1/3 the distance across the valve face (Figs 26–27). A single rimoportula is found on one of the valve apices. Type:— CANADA. Lac de Gras kimberlite field region, Northwest Territories: Rock specimen sub sampled from section 15-3-75 of the Giraffe Pipe core (holotype circled specimen on slide “ GP 15-3 - 75 D, LM 5” Canadian Museum of Nature CANA 129308 = Fig. 17. Isotype circled specimen on slide labeled “ GP 15-3 - 75 LM4” P. Siver’s personal collection = Fig. 21). Etymology:— The name refers to a hat, whereby smaller specimens give the impression of a hat worn, for example, by Napoleon.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 0.003 |
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".