Bibliographic record
Abstract
Genus Meristorygma Carter, 1974 Type species Meristorygma arctica Carter, 1974; original designation. Diagnosis Medium-sized shell with diverse outline; fold and sulcus moderately developed. Well-defined sulcus with two, rarely four primary ribs and median furrow; uniplicate anterior commissure usually with subquadrate tongue; fold with three distinct ribs; the central with weakly furrow. Ribs on sides are few and weak. Hinge line of short, smooth ventral interarea non-denticulated. Ventral adminicula and dorsal crural plates are absent; vascula ramose, radially arranged with a pair of strong vascular media, which correspond to the pair of costae in the sulcus. Microornament is absent. Species included Arctic Canada and southeastern Alaska (Carter 1974: 674): Meristorygma arctica Carter, 1974; Pennsylvanian. Russia, Northern and Polar Ural (Kutorga 1844; Kalashnikov 1980): M. panduriformis (Kutorga, 1844); upper Pennsylvanian–Lower Permian; M. pajkchoica Kalashnikov, 1980; Moscovian. South Ural (Bashkortostan)and Middle Asia (Yanishevsky 1900; Poletaev 2018): M. gracilis (Yanishevsky, 1900) upper Serpukhovian–lower Bashkirian; (this paper) M. donakovae Poletaev, 2018; uppermost Visean–Serpukhovian, Magnitogorsk district. Ukraine, Donets Basin (Rotai 1951; Poletaev 2018): M. miussensis (Rotai, 1951) upper Bashkirian; M. postgracilis (Rotai, 1951); Moscovian. Remarks The analysis of the ventral valve of the natural mould of Meristorygma arctica (Carter & Poletaev 1998) has shown that the species has a ramose, radially arranged vascular system with a twin of strong vascular media, in contrast to Brachythyris ovalis (Phillips, 1836), which has a weak, simple, pinnate vascular system. The variability of the vascular system of related taxa may mostly be the result of evolution (Lazarev & Poletaev 1982).
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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 | 0.002 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.006 | 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".