Cranial anatomy of<i>Coloraderpeton brilli</i>, postcranial anatomy of<i>Oestocephalus amphiuminus</i>, and reconsideration of Ophiderpetontidae (Tetrapoda: Lepospondyli: Aistopoda)
Bibliographic record
Abstract
ABSTRACT The cranial anatomy of Coloraderpeton brilli Vaughn and postcranial anatomy of Oestocephalus amphiuminus Cope are reconsidered in light of new ophiderpetontid material from Nýřany, Czech Republic. Coloraderpeton is distinct from Oestocephalus amphiuminus in having a quadrate region extended farther posterior of the occiput and a tabular restricted from the lateral temporal margin by the supratemporal. In contrast to the original description, Coloraderpeton, like all lepospondyls, lacks an intertemporal. Coloraderpeton has widely spaced teeth, which bring into question the utility of this character for separating Ophiderpeton from Oestocephalus. Coloraderpeton has multiple rows of teeth on its palatoquadrate, as opposed to the single row in Oestocephalus. Oestocephalus has approximately 110 vertebrae. Vertebrae are not added posteriorly with growth, making vertebral counts of systematic significance in aïstopods. Transverse processes remain laterally directed throughout the column, unlike Phlegethontia, which has an anterior migration of the bases of the transverse processes, and an anterior inflection of the distal transverse processes that becomes more pronounced posteriorly. Ribs are present to about the 70th vertebra, leaving 40 rib-free caudal vertebrae, contrasting with the 100–160 rib-free caudal vertebrae of Phlegethontia. Ribs are “k-shaped,” with an anterior costal process and a long posterior process on either side of the tuberculum. No distinction can be made among any of the species from Linton, Ohio, Mazon Creek, Illinois, and Nýřany, Czech Republic, and so all are included within Oestocephalus amphiuminus. The exception is O. nanum from Newsham, Northumberland, which has reduced dorsal osteoderms. Preliminary phylogenetic analysis indicates that Ophiderpetontidae as previously understood are paraphyletic, and a new family, Oestocephalidae, is established to accommodate Oestocephalus and Coloraderpeton.
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 distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| 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 teacher head, 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".