A diminutive temnospondyl amphibian from the Pennsylvanian of Illinois
Bibliographic record
Abstract
A siderite concretion from the Middle Pennsylvanian, Francis Creek Shale (Carbondale Formation, Desmoinesian Series, Westphalian C), in the Mazon Creek area, WillKankakee counties, Illinois, U.S.A., preserves a hitherto unknown temnospondyl amphibian. The natural mold of the dorsoventrally compressed skeleton (total preserved length of the larva is 38.5 mm (~1.5 inches)), includes a proportionately large skull, hyobranchial denticles, ossified portions of the axial skeleton, elements of both the pectoral and pelvic limbs, and endocasts of segments of the digestive system. Differential staining of the entombing matrix outlines gill filaments, portions of the body wall, and apparently most of the length of the tail. Although this single specimen probably represents a new taxon, too few diagnostic characters are displayed by the larva to name a new species. Large interpterygoid vacuities support its inclusion in the Temnospondyli. Vomers contributing to the formation of the anterior margin of these vacuities place this taxon above the edopoid grade of organization. Furthermore, a very wide cultriform process of the parasphenoid places this taxon above dendrerpetontids. Specific characters that would ally this taxon with any known family have not been identified.
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 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".