Redescription of a Middle Devonian placoderm from Manitoba and comments on the polyphyly of <i>Eastmanosteus</i> (Arthrodira: Eubrachythoraci)
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Arthrodires are the most common and diverse placoderms, an extinct group of early jawed vertebrates. Although commonly found, numerous taxa remain poorly known, thereby complicating the establishment of their taxonomic affinities. An excellent example of this is the genus Eastmanosteus: originally assigned to the wastebasket Dinichthys, it now comprises several species whose description was based on highly incomplete material. Thus, it has been suggested that Eastmanosteus, in turn, has become a wastebasket taxon. Here we redescribe Elmosteus lundarensis gen. et comb. nov., previously assigned to Eastmanosteus. An updated description is provided based on new material recovered from the Elm Point Formation, Middle Devonian (Eifelian–Givetian), near Lake Manitoba, MB, Canada, including gnathal elements, the median dorsal plate, and a ventral view of the skull roof. Parsimony and Bayesian phylogenetic analyses were performed, in which the more complete species of Eastmanosteus were included. Elmosteus is recovered as a basal dunkleosteid and all analyses support the polyphyly of Eastmanosteus. A brief discussion about intraspecific variation in El. lundarensis is also provided. Revisions of taxa described long ago, such as Eastmanosteus, using modern techniques like computational phylogenetics is essential for further improved taxonomy. This will lead to a better definition of relationships within placoderms and a better understanding of their diversity, and in turn help us trace the early evolutionary steps of vertebrate traits among stem gnathostomes. https://zoobank.org/urn:lsid:zoobank.org:pub:C52D3188-ED7F-4C7B-83C6-4A78C88B1591
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.
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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it