Bibliographic record
Abstract
Cavinula variostriata (Krasske) Mann in Round et al. 1990 (Figs 123, 124) Basionym: Navicula variostriata Krasske 1923, 197: 12 Valves linear, with rounded apices. Valve length 30–32 µm, width 7–8 µm. Striae curved and radiate throughout valve length. Stria density 24–27 in 10 µm. Axial area narrow and linear. Central area rectangular to broadly rounded, extending to valve margin with reduced marginal striae. Central area forms a large internally expanded nodule. Raphe linear; proximal raphe fissures externally small teardrop like; internally proximal fissures weakly deflected in opposite directions and terminal fissures ends with small helictoglossae. Distal raphe fissures externally deflected in opposite directions and terminate on valve face. Areolae round to elliptic externally and internally. Internal areolae openings covered by hymen. Type:— Hessen, Germany. Observations:— This taxon is identified by the linear valve margins, large central area, evident internally expanded central nodule, and the oppositely deflected terminal raphe fissure that do not extend down the mantle. Distribution:— Cavinula variostriata occurs in the northern regions of Europe, and North America. In the CANA collection this taxon was identified from 26 localities from Axel Heiberg Island, Ellesmere Island, Baffin Island (Arctic Archipelago), Lac Karinbou (northern Québec) and unnamed lakes in central Ontario. In the USA, C. variostriata was tentatively reported from 13 locations but to date only samples from Murder Creek (New Jersey), Red Mill Pond (Delaware) and Johnson Creek (Montana) have been verified. Specimens from New Jersey and Delaware are more elliptical in shape and the central area is smaller compared to specimens from the Arctic Archipelago. C. variostriata needs a more detailed study in North America. Distribution Records:— Lange-Bertalot et al. (1996, fig. 18: 27–30, Europe), Krammer & Lange-Bertalot (1986, fig. 59: 10, 11, Europe), Güttinger (1991, fig. 2.05: 31–34, Great Britain), Foged (1974, fig. 13: 8, 9, Iceland), Potapova (2014, fig. 214, Bering Island, Kamchatka Peninsula, Russia).
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 | 0.000 |
| 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 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.008 | 0.002 |
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".