The Superciliaspididae, a new family of Early Devonian Osteostraci (jawless vertebrates) from northern Canada, with two new genera and three new species
Bibliographic record
Abstract
Three new species in two new genera of cornuate Osteostraci are described here based on specimens from the Early Devonian (Lochkovian) Man on the Hill (MOTH) locality in the Mackenzie Mountains, Northwest Territories, Canada. The new taxa share several characteristics with Superciliaspis gabrielsei. Glabrapelta gen. nov., and its two species, G. cristata sp. nov. and G. minima sp. nov., are based on four previously undescribed specimens. Dentapelta loefflerae gen. et sp. nov. is based on one newly recovered specimen, along with another specimen originally referred by earlier workers to ‘Cephalaspidinae indet.’ Together with Superciliaspis, these new genera are subjected to a phylogenetic analysis, building on earlier work by R. Sansom. The results indicate that all four species in three genera belong to a single clade that is here named as the new family Superciliaspididae. The Superciliaspididae are characterized by a long, narrow median field with a border of raised ridges of fused plates, by narrow and posteriorly pointing cornua, and by orbits close together. A laterally expanded pineal opening and raised orbital rims place the Superciliaspididae as sister to the clade Scolenaspididae + Zenaspididae in the Order Zenaspidida. Internal anatomy of the nasohypophysial opening confirms separate internal nasal and hypophysial ducts. To date, the Superciliaspididae have been found only at the MOTH locality in the Mackenzie Mountains of northern Canada, whereas related taxa are distributed more widely in North America, Spitsbergen and Europe.http://zoobank.org/urn:lsid:zoobank.org:pub: F69DDE22-311A-4F2A-9B5D-8E59D13341E2
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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.003 | 0.002 |
| Science and technology studies | 0.004 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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".